Preliminary Requirements

Safety Requirements

WARNING

IT IS RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE CONSUMABLE MATERIAL MANUFACTURER'S SAFETY DATA SHEETS FOR CONSUMABLE MATERIAL SAFETY INFORMATION (SUCH AS HAZARDOUS INGREDIENTS, PHYSICAL/CHEMICAL CHARACTERISTICS, FIRE HAZARD DATA, EXPLOSION HAZARD DATA, REACTIVITY HAZARD DATA, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, USE AND CONTROL MEASURES), AND ALSO TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.

CAUTION

USE ONLY THIS PROCEDURE OR TASK 70-11-26-300-503 SOLVENT WIPE METHOD WHEN THE CLEANING SOLUTION CAN GET CAUGHT INSIDE THE PART.

Procedure

1. SUBTASK 70-38-24-380-001 Apply a Mechanical Mask and/or Fixture to Areas Specified.

   
   CAUTION
   WEAR CLEAN COTTON GLOVES WHEN YOU TOUCH THE PARTS AFTER CLEANING AND BEFORE MASKING.
   
   CAUTION
   WHEN CURRENT IS APPLIED TO A PART DURING STRIPPING OR PLATING PROCESSES, IT IS IMPORTANT TO KEEP AN ADEQUATE AREA OF POSITIVE CONTACT TO PREVENT POSSIBLE BURNING.

   NOTE

   Parts must be clean, fully dry and at approximately room temperature before masking.

   1. Degrease the parts. Refer to SPM TASK 70-11-03-300-503.

   2. 
      CAUTION
      PARTS MUST BE CAREFULLY MASKED TO PREVENT STRIPPING THE PLATING FROM OTHER AREAS OF THE SAME PARTS.

      NOTE

      If you mask the parts made from materials that will corrode in the shop air, do not permit too much time to pass before you do the repair operation because the surfaces will corrode before you do the procedure.

      Apply the maskant as follows.

      1. Mask with a fixture and/or a mechanical mask, if specified.

   3. Remove the maskant as follows.

      1. Remove the maskant and the fixture from the part.

      2. Examine the mask and the fixture for damage, wear and too much build-up of plating.

      3. Examine the part for total removal of the maskant.

   4. Preserve the part, if necessary. Refer to SPM TASK 70-38-05-380-501.

2. SUBTASK 70-38-24-380-002 Apply the Tape to Areas Specified

   
   CAUTION
   WEAR CLEAN COTTON GLOVES WHEN YOU TOUCH THE PARTS AFTER CLEANING AND BEFORE MASKING.
   
   CAUTION
   WHEN CURRENT IS APPLIED TO A PART DURING STRIPPING OR PLATING PROCESSES, IT IS IMPORTANT TO KEEP AN ADEQUATE AREA OF POSITIVE CONTACT TO PREVENT POSSIBLE BURNING.

   NOTE

   Refer to SPM TASK 70-34-18-380-501 for a list of heat resistant tapes.

   NOTE

   Parts must be clean, fully dry and at approximately room temperature before masking.

   1. Degrease the part. Refer to SPM TASK 70-11-03-300-503.

   2. 
      CAUTION
      PARTS MUST BE CAREFULLY MASKED TO PREVENT STRIPPING THE PLATING FROM OTHER AREAS OF THE SAME PARTS.

      NOTE

      If you mask the parts made from materials that will corrode in the shop air, do not permit too much time to pass before you do the repair operation because the surfaces will corrode before you do the procedure.

      Apply the maskant as follows.

      NOTE

      1. You can do this step before or after taping as applicable.

      2. If you use an electrical contact fixture, do a check of the electrical contact with a continuity meter.

      1. Assemble the part to the fixture.

      2. Apply one of the applicable tapes as follows to the areas specified.

         1. The tapes in the subsequent list are approved for Step and Step.

            1. CoMat 02-033.

               1. This tape is resistant to acids, alkalis, salt solutions and alcohol. It is approved as a maskant for the plating of parts or plating racks.

            2. CoMat 02-036.

               1. This chemical and heat resistant tape has a silicone pressure-sensitive adhesive on a flat polyester film. It is a stop-off for metallic parts during chemical processing.

            3. CoMat 02-134.

               1. This strong pressure-sensitive tape is resistant to acids, alkalis, salt solutions and alcohol.

            4. CoMat 02-229.

               1. This tape is resistant to acids, alkalis, salt solutions and alcohol. It is approved as a maskant for the plating of parts or plating racks. Because this tape is not adhesive, you can seal the end with the solvent supplied with the tape or you can tie the end or seal it with a piece of adhesive tape.

            5. CoMat 02-230.

               1. This tape is resistant to acids, alkalis, salt solutions and alcohol. It is approved as a maskant for the plating of parts or plating racks. Because this tape is not adhesive, you can seal the end with the solvent supplied with the tape or you can tie the end or seal it with a piece of adhesive tape.

            6. CoMat 02-232.

               1. This strong plastic-backed tape is resistant to abrasive blasting, shotpeening, mass media finishing, acids, alkalis, salt solutions and alcohol. It is approved for mass media finishing and plating.

            7. CoMat 02-233.

               1. This polyvinyl chloride tape is resistant to long-term exposure to 220 deg F (104 deg C). Use this tape when good adhesion and fine line definition are necessary.

            8. CoMat 02-234.

               1. This polyvinyl chloride tape is easy to remove after remaining on parts for long periods of time. It is resistant to plating temperatures up to 220 deg F (104 deg C).

         2. The tapes in the subsequent list are approved for Step.

            1. CoMat 02-034.

               1. This pressure-sensitive adhesive tape is approved to use during electroplating for masking. It prevents the build-up of too much plating.

            2. CoMat 02-047.

               1. This aluminum foil, glass cloth-laminated tape with pressure-sensitive silicone adhesive is resistant to long-term exposure to 600 deg F (316 deg C) and short-term exposure to 1000 deg F (538 deg C). It is approved to use, where applicable, for protection of surfaces during high temperature processing.

            3. CoMat 02-228.

               1. This rubber or vinyl film-backed tape is resistant to extreme high pressure blasting at close range. It is approved as a maskant for parts during blasting and/or shotpeening. It is also approved to reinforce worn steel blast and/or shotpeen masks.

   3. Remove tape maskant as follows.

      NOTE

      You can do step (1) before or after maskant removal.

      1. Remove, if necessary, the plating fixture from the part.

      2. Examine the part and the fixture for damage, wear and too much build-up of plating.

      3. Remove all the tape applied to the part.

      4. Rub off any remaining tape adhesive by one of the procedures that follow.

         1. Use a cloth wet with a solvent from the SPM TASK 70-11-26-300-503.

         2. Use a cloth wet with CoMat 10-096 OIL-CLEANER/DEGREASER,WATERWASHABLE then, remove with a cloth wet with water.

      5. Examine the part for total removal of the maskant.

   4. Preserve the part, if necessary. Refer to SPM TASK 70-38-05-380-501.

3. SUBTASK 70-38-24-380-003 Apply the Lacquer to Areas Specified

   
   CAUTION
   WEAR CLEAN COTTON GLOVES WHEN YOU TOUCH THE PARTS AFTER CLEANING AND BEFORE MASKING.
   
   CAUTION
   WHEN CURRENT IS APPLIED TO A PART DURING STRIPPING OR PLATING PROCESSES, IT IS IMPORTANT TO KEEP AN ADEQUATE AREA OF POSITIVE CONTACT TO PREVENT POSSIBLE BURNING.

   NOTE

   Parts must be clean, fully dry, and at approximately room temperature before masking.

   1. Degrease the parts. Refer to SPM TASK 70-11-03-300-503.

   2. 

      CAUTION

      PARTS MUST BE CAREFULLY MASKED TO PREVENT STRIPPING THE PLATING FROM OTHER AREAS OF THE SAME PARTS.

      NOTE

      If you use an electrical contact fixture, do a check of the electrical contact with a continuity meter.

      If necessary, assemble the part to the electrical contact fixture specified by the repair.

   3. 
      CAUTION
      PARTS MUST BE CAREFULLY MASKED TO PREVENT STRIPPING THE PLATING FROM OTHER AREAS OF THE SAME PARTS.
      
      CAUTION
      AREAS TO BE PLATED MUST BE FREE OF LACQUER.

      Apply the maskant as follows.

      NOTE

      If you mask the parts made from materials that will corrode in the shop air, do not permit too much time to pass before you do the repair operation because the surfaces will corrode before you do this procedure.

      1. Apply two layers of one of the lacquers given below with a spray or a brush. Permit the lacquer to dry between each layer.

         1. For effectively masking surfaces during plating, stripping and pack coating, use the easy-to-remove lacquer that follows.

            CoMat 07-055 STOP-OFF LACQUER.

         2. For effectively masking surfaces during plating or stripping, use the easy-to-remove lacquer that follows.

            CoMat 07-056 STOP-OFF LACQUER FOR ALKALIIMMERS..

         3. For effectively masking surfaces during plating, stripping and anodizing, use the lacquer that follows.

            CoMat 07-110 STOP-OFF LACQUER.

   4. Remove the lacquer from the areas that are to be plated by one of the methods that follows:

      1. Use a cloth made wet with CoMat 10-096 OIL-CLEANER/DEGREASER,WATERWASHABLE.

      2. Use CoMat 02-008 PUMICE POWDER and a cloth.

         1. Rub off pumice with a clean cloth or with a blast of clean dry air.

   5. Let the part dry in air for two to four hours.

   6. Remove the lacquer maskant as follows.

      NOTE

      You can do step (1) before or after maskant removal.

      1. Remove, if necessary, the plating fixture from the part, at this time.

      2. Examine the part and fixture for damage, wear and too much build-up of plating.

      3. Remove the lacquer with plastic blasting (Refer to SPM TASK 70-12-07-120-501) or with a solvent from the SPM TASK 70-11-26-300-503; then, flush fully with water.

      4. Examine the part for total removal of the maskant.

      5. Preserve the part, if necessary. Refer to SPM TASK 70-38-05-380-501.

4. SUBTASK 70-38-24-380-004 Procedure To Apply Wax

   1. Use Step or Step.

   2. See Table for approved waxes and applicable temperatures for Step or Step.

      Table 1.

      CoMat Item No.	Wax Temperature		Description
      	First Coat	Second Coat
      CoMat 02-021	210 deg F - 240 deg F (99 deg C - 116 deg C)	180 deg F -240 deg F (82 deg C - 116 deg C)	This wax is for selective chemical processing. It is made of natural petroleum waxes and synthetic waxes, and resins. The melting point is 165 deg F - 185 deg F (74 deg C - 85 deg C). The flash point is 400 deg F (204 deg C) minimum. The color of this wax is dark brown.
      CoMat 02-038	210 deg F - 240 deg F (99 deg C - 116 deg C)	200 deg F - 240 deg F (93 deg C - 116 deg C)	This wax is for selective chemical processing. It is made of natural petroleum waxes and synthetic waxes, and resins. The melting point is 175 deg F (79 deg C) minimum. The flash point is 550 deg F (288 deg C) minimum. The color of this wax is white to yellow.
      CoMat 02-235	185 deg F - 215 deg F (85 deg C - 102 deg C)	150 deg F - 215 deg F (66 deg C - 102 deg C)	This wax is for selective chemical processing. It is made of natural petroleum waxes and synthetic waxes, and resins. The melting point is 138 deg F - 148 deg F (59 deg C - 64 deg C). The flash point is 450 deg F (232 deg C) minimum. The color of this wax is blue.
      CoMat 02-370	194 deg F - 212 deg F (90 deg C - 100 deg C)	194 deg F - 212 deg F (90 deg C - 100 deg C)	This wax is for selective chemical processing. The melting point is 185 deg F (85 deg C). When the temperature is more than 212 deg F (100 deg C), the wax can start to burn. The color of this wax is yellow when new, and becomes light brown to darker brown after you start to use it.

5. SUBTASK 70-38-24-380-004-001 Apply Wax by Immersion to Areas Specified

   
   CAUTION
   PARTS MUST BE CAREFULLY MASKED TO PREVENT STRIPPING THE PLATING FROM OTHER AREAS OF THE SAME PARTS.

   NOTE

   The immersion method is an alternative to wax application by brush. Refer to TASK 70-38-24-380-004-002.

   NOTE

   If you mask the parts made from materials that will corrode in the shop air, do not permit too much time to pass before you do the repair operation because the surfaces will corrode before you do this procedure.

   NOTE

   Parts must be clean, fully dry and at approximately room temperature before masking.

   1. Degrease the parts. Refer to SPM TASK 70-11-03-300-503. Wear clean cotton gloves when you touch the cleaned parts before you apply the wax.

   2. If necessary, assemble the part to the electrical contact fixture specified by the repair.

      1. 

         CAUTION

         WHEN CURRENT IS APPLIED TO A PART DURING STRIPPING OR PLATING PROCESSES, IT IS IMPORTANT TO KEEP AN ADEQUATE AREA OF POSITIVE CONTACT TO PREVENT POSSIBLE BURNING.

         If you use an electrical contact fixture, do a check of the electrical contact with a continuity meter.

      2. Before you assemble the contact fixture for chromium plating gears, put one layer of CoMat 02-034 METALLIC MASKING TAPE(LEAD FOIL) over the contact area to prevent etching under the contact fixture.

   3. Apply tape, if necessary, as an aid in the removal of wax from these areas to be plated. Refer to paragraph Step.

   4. As an aid in the removal of wax from those areas that must have contact with chemical solutions in the specified chemical procedure, it is permitted to use one of the subsequent procedures.

      1. Masking tape procedure.

         1. Apply CoMat 02-227 MASKING TAPE (CREPE PAPERBACKING) or an applicable tape from Step, to those areas that must have contact with chemical solutions in the specified chemical procedure.

      2. Glycerin/calcium carbonate mixture procedure.

         1. Make a mixture of approximately 50 percent by volume of CoMat 02-395 GLYCERIN and approximately 50 percent by volume of CoMat 02-396 CALCIUM CARBONATE POWDER.

            1. Storage of the mixture must be in closed containers.

            2. Mix the mixture fully before you use it.

         2. Use a brush to apply the glycerin/calcium carbonate mixture to those areas that must have contact with chemical solutions in the specified chemical procedure.

            1. 

               CAUTION

               IF YOU LET THE GLYCERIN/CALCIUM CARBONATE MIXTURE GO ONTO AREAS THAT MUST HAVE PROTECTION FROM THE SPECIFIED CHEMICAL PROCEDURE, THE WAX WILL NOT BOND CORRECTLY TO THOSE AREAS, WHICH CAN CAUSE LEAKAGE OF THE CHEMICAL PROCEDURE SOLUTIONS ONTO THOSE AREAS.

               Make sure to keep the glycerin/calcium carbonate mixture away from part surfaces that must have wax masking for protection from the specified chemical procedure.

   5. Apply wax by immersion as follows.

      1. Apply a minimum of two layers of wax as follows:

         1. Put the part fully in a tank of clean wax to apply the first layer.

            1. Use an applicable wax from Table at the applicable first coat temperature.

            2. For good bonding, permit the part to stay fully in the tank of wax until the part temperature is approximately at the wax temperature.

         2. Remove the part from the wax.

         3. Let the applied wax layer set.

         4. To apply the second layer, and subsequent layers, of wax, do the subsequent procedure:

            NOTE

            It is easier to apply the second layer and subsequent layers of wax if the wax temperature is approximately equal to the minimum second coat temperature for the applied wax in Table.

            1. Put the part fully in a tank of clean wax, and then remove the part from the wax.

               1. Use an applicable wax from Table at the applicable second coat temperature.

               2. For the second and subsequent layers of wax, it is permitted to use wax from the dewaxing tank as an alternative to the clean wax.

            2. Let the applied wax layer set.

            3. Do this procedure again until the wax thickness is sufficient.

   6. Trim the wax where a clean cut edge is necessary. Use one of the subsequent procedures:

      1. 

         CAUTION

         WHEN YOU USE A TRIMMING BLADE TO CUT THE MASKANT, TOO MUCH PRESSURE ON THE BLADE WILL CAUSE A SCRATCH ON THE SURFACE, AND SOME SOLUTIONS WILL INCREASE THE EFFECT OF THIS DAMAGE.

         NOTE

         To make the removal of the wax easier, be sure the wax continues to stay warm, or use a heated metal trimming blade.

         Carefully cut the wax with a trimming blade.

      2. Use a sharp-edged piece of wood or CoMat 02-068 DEPRESSORS, TONGUE that is wrapped in a cloth that is wet with CoMat 10-096 OIL-CLEANER/DEGREASER,WATERWASHABLE.

      3. Use a sharp-edged piece of wood or CoMat 02-068 DEPRESSORS, TONGUE that is wrapped in a cloth that is wet with a solvent from SPM TASK 70-11-26-300-503.

   7. Clean the masked part for the specified chemical procedure.

      NOTE

      It is easier to remove the tape when the wax is warm.

      1. Remove the tape that you applied as an aid in the removal of wax from the part surfaces that must have contact with chemical solutions in the specified chemical procedure.

      2. Do one of these procedures to clean the part surfaces that must have contact with chemical solutions in the specified chemical procedure:

         1. Procedure 1:

            1. Fully clean the part with a cloth that is wet with CoMat 10-096 OIL-CLEANER/DEGREASER,WATERWASHABLE to remove remaining wax and tape from the part surfaces that must have contact with chemical solutions in the specified chemical procedure.

            2. Put the cleaned part fully in water or alkali solution, or rub with a cloth wet with water to remove remaining CoMat 10-096 OIL-CLEANER/DEGREASER,WATERWASHABLE.

         2. Procedure 2:

            1. Fully clean the part with a cloth that is wet with a solvent from SPM TASK 70-11-26-300-503 to remove remaining wax and tape from the part surfaces that must have contact with chemical solutions in the specified chemical procedure.

      3. Use CoMat 02-008 PUMICE POWDER and a cloth to clean the part surfaces that must have contact with chemical solutions in the specified chemical procedure.

      4. Remove remaining pumice powder with a clean cloth or blast of clean dry air.

   8. Remove the wax maskant after the specified chemical procedure.

      1. Use the one of the subsequent procedures to remove the wax:

         1. Wax Maskant Removal Procedure 1:

            NOTE

            You can do Step before or after maskant removal.

            1. Remove, if necessary, the processing fixture from the part at this time.

            2. Examine the part and fixture for damage, wear and too much build-up of plating.

            3. Put the part fully in a hot wax tank or in hot water. The temperature must be more than the maximum applicable temperature given in Table.

            4. Remove any remaining wax with the SPM TASK 70-38-36-380-501 or approved equivalent.

            5. Examine the part for total removal of the maskant.

         2. Wax Maskant Removal Procedure 2:

            1. Put the part fully in a hot wax tank or in hot water. The temperature must be more than the maximum applicable temperature given in Table.

            2. Remove, if necessary, the processing fixture from the part at this time.

            3. Examine the part and fixture for damage, wear and too much build-up of plating.

            4. Remove any remaining wax with the SPM TASK 70-38-36-380-501 or approved equivalent.

            5. Examine the part for total removal of the maskant.

      2. Preserve the part, if necessary. Refer to SPM TASK 70-38-05-380-501.

6. SUBTASK 70-38-24-380-004-002 Apply the Wax by Brush to Areas Specified

   
   CAUTION
   PARTS MUST BE CAREFULLY MASKED TO PREVENT STRIPPING THE PLATING FROM OTHER AREAS OF THE SAME PARTS.

   NOTE

   Application of wax by brush is an alternative to the immersion method. Refer to TASK 70-38-24-380-004-001.

   NOTE

   1. This method uses small, bench-type wax pots.

   2. If you mask the parts made from materials that will corrode in the shop air, do not permit too much time to pass before you do the repair operation because the surfaces will corrode before you do the procedure.

   NOTE

   Parts must be clean, fully dry, and at approximately room temperature before masking.

   1. Degrease the parts. Refer to SPM TASK 70-11-03-300-503. Wear clean cotton gloves when you touch the cleaned parts before you apply the wax.

   2. If necessary, assemble the part to the electrical contact fixture specified by the repair.

      1. 

         CAUTION

         WHEN CURRENT IS APPLIED TO A PART DURING STRIPPING OR PLATING PROCESSES, IT IS IMPORTANT TO KEEP AN ADEQUATE AREA OF POSITIVE CONTACT TO PREVENT POSSIBLE BURNING.

         If you use an electrical contact fixture, do a check of the electrical contact with a continuity meter.

      2. Before you assemble the contact fixture for chromium plating gears, put one layer of CoMat 02-034 METALLIC MASKING TAPE(LEAD FOIL) over the contact area to prevent etching under the contact fixture.

   3. Apply tape, if necessary, as an aid in the removal of wax from these areas to be plated. Refer to paragraph Step.

   4. As an aid in the removal of wax from those areas that must have contact with chemical solutions in the specified chemical procedure, it is permitted to use one of the subsequent procedures.

      1. Masking tape procedure.

         1. Apply CoMat 02-227 MASKING TAPE (CREPE PAPERBACKING) or an applicable tape from Step, to those areas that must have contact with chemical solutions in the specified chemical procedure.

      2. Glycerin/calcium carbonate mixture procedure.

         1. Make a mixture of approximately 50 percent by volume of CoMat 02-395 GLYCERIN and approximately 50 percent by volume of CoMat 02-396 CALCIUM CARBONATE POWDER.

            1. Storage of the mixture must be in closed containers.

            2. Mix the mixture fully before you use it.

         2. Use a brush to apply the glycerin/calcium carbonate mixture to those areas that must have contact with chemical solutions in the specified chemical procedure.

            1. 

               CAUTION

               IF YOU LET THE GLYCERIN/CALCIUM CARBONATE MIXTURE GO ONTO AREAS THAT MUST HAVE PROTECTION FROM THE SPECIFIED CHEMICAL PROCEDURE, THE WAX WILL NOT BOND CORRECTLY TO THOSE AREAS, WHICH CAN CAUSE LEAKAGE OF THE CHEMICAL PROCEDURE SOLUTIONS ONTO THOSE AREAS.

               Make sure to keep the glycerin/calcium carbonate mixture away from part surfaces that must have wax masking for protection from the specified chemical procedure.

   5. Apply wax by brush as follows:

      1. Preheat the part to 130 deg F (54 deg C).

      2. Apply the wax with a brush.

         1. Use an applicable wax at the applicable first coat temperature. See Table.

   6. Trim the wax where a clean cut edge is necessary. Use one of the subsequent procedures:

      1. 

         CAUTION

         WHEN YOU USE A KNIFE TO CUT THE MASKANT, TOO MUCH PRESSURE ON THE KNIFE WILL CAUSE A SCRATCH ON THE SURFACE. SOME SOLUTIONS WILL INCREASE THE EFFECT OF THIS DAMAGE.

         NOTE

         To make the removal of the wax easier, be sure the wax continues to stay warm, or use a heated metal trimming blade.

         Carefully cut the wax with a trimming blade.

      2. Use a sharp-edged piece of wood or CoMat 02-068 DEPRESSORS, TONGUE that is wrapped in a cloth that is wet with CoMat 10-096 OIL-CLEANER/DEGREASER,WATERWASHABLE.

      3. Use a sharp-edged piece of wood or CoMat 02-068 DEPRESSORS, TONGUE that is wrapped in a cloth that is wet with a solvent from SPM TASK 70-11-26-300-503.

   7. Clean the masked part for the specified chemical procedure.

      NOTE

      To make the removal of the tape easier, remove the tape while the wax is warm.

      1. Remove the tape that you applied as an aid in wax removal from the part surfaces that must have contact with chemical solutions in the specified chemical procedure.

      2. Do one of these procedures to clean the part surfaces that must have contact with chemical solutions in the specified chemical procedure:

         1. Procedure 1:

            1. Fully clean the part with a cloth that is wet with CoMat 10-096 OIL-CLEANER/DEGREASER,WATERWASHABLE to remove remaining wax and tape from the part surfaces that must have contact with chemical solutions in the specified chemical procedure.

            2. Put the cleaned part fully in water or alkali solution, or rub with a cloth wet with water to remove remaining CoMat 10-096 OIL-CLEANER/DEGREASER,WATERWASHABLE.

         2. Procedure 2:

            1. Fully clean the part with a cloth that is wet with a solvent from SPM TASK 70-11-26-300-503 to remove remaining wax and tape from the part surfaces that must have contact with chemical solutions in the specified chemical procedure.

      3. Use CoMat 02-008 PUMICE POWDER and a cloth to clean the part surfaces that must have contact with chemical solutions in the specified chemical procedure.

      4. Remove remaining pumice powder with a clean cloth or blast of clean dry air.

   8. Remove the wax maskant after the specified chemical procedure.

      1. Use the one of the subsequent procedures to remove the wax:

         1. Wax Maskant Removal Procedure 1:

            NOTE

            You can do Step before or after maskant removal.

            1. Remove, if necessary, the processing fixture from the part at this time.

            2. Examine the part and fixture for damage, wear and too much build-up of plating.

            3. Put the part fully in a hot wax tank or in hot water. The temperature must be more than the maximum applicable temperature given in Table.

            4. Remove any remaining wax with the SPM TASK 70-38-26-380-501 or approved equivalent.

            5. Examine the part for total removal of the maskant.

         2. Wax Maskant Removal Procedure 2:

            1. Put the part fully in a hot wax tank or in hot water. The temperature must be more than the maximum applicable temperature given in Table.

            2. Remove, if necessary, the processing fixture from the part at this time.

            3. Examine the part and fixture for damage, wear and too much build-up of plating.

            4. Remove any remaining wax with the SPM TASK 70-38-26-380-501 or approved equivalent.

            5. Examine the part for total removal of the maskant.

      2. Preserve the part, if necessary. Refer to SPM TASK 70-38-05-380-501.

7. SUBTASK 70-38-24-380-005 Apply Chemical Maskant, if Necessary

   
   CAUTION
   WEAR CLEAN COTTON GLOVES WHEN YOU TOUCH THE PARTS AFTER CLEANING AND BEFORE MASKING.
   
   CAUTION
   WHEN CURRENT IS APPLIED TO A PART DURING STRIPPING OR PLATING PROCESSES, IT IS IMPORTANT TO KEEP AN ADEQUATE AREA OF POSITIVE CONTACT TO PREVENT POSSIBLE BURNING.

   NOTE

   Parts must be clean, fully dry and at approximately room temperature before masking.

   1. Degrease the parts. Refer to SPM TASK 70-11-03-300-503.

   2. If necessary, assemble the part to the correct tooling for processing. If you use an electrical contact fixture, do a check of the electrical contact with a continuity meter.

   3. See Table for approved chemical maskants.

      Table 2. Approved Chemical Maskants

      CoMat Item No.	Description
      CoMat 02-066	This maskant is approved for selective chemical processing, such as chemical milling or plating.
      CoMat 02-067	This coating is approved for selective chemical processing as a maskant during the stripping (removal) of overlay coatings.
      CoMat 02-258	This coating is approved for selective chemical processing as a maskant during the stripping (removal) of overlay coatings, and during high-temperature chemical cleaning.
      CoMat 02-259	This maskant is approved for selective chemical processing. It is made of a non-oil extruding compound. One coat is usually sufficient for most applications. Do not use this material on titanium alloy or titanium parts.

   4. Apply the maskant as follows:

      1. 
         CAUTION
         DO NOT PERMIT THE MASKED PARTS TO TOUCH EACH OTHER BEFORE, DURING OR IMMEDIATLY AFTER CURING BECAUSE THE PARTS WILL STICK TOGETHER AND THE MASK WILL RECEIVE DAMAGE WHEN THE PARTS ARE SEPARATED.

         Do the applicable procedure in the subsequent list to apply the maskant:

         1. For CoMat 02-066 CHEMICAL MILLING MASKANT, CoMat 02-067 STRIPPABLE COATING, or CoMat 02-258 STRIPPABLE COATING, do the subsequent procedure:

            1. Refer to the manufacturer's instructions to apply the chemical maskant to get the necessary mask thickness, and to cure the applied chemical maskant.

         2. For CoMat 02-259 CHEMICAL MASKANT, do the subsequent procedure:

            NOTE

            CoMat 02-259 CHEMICAL MASKANT is not approved for titanium or for titanium alloys.

            1. Refer to the manufacturer's instructions to apply the chemical maskant to get the necessary mask thickness.

      2. To selectively remove the maskant from the area to be plated, do the subsequent procedure:

         1. Use tooling to scribe and to remove the maskant from the area to be plated.

         2. 

            CAUTION

            IF YOU SCRATCH OR DAMAGE THE SURFACE OF THE PART, PART FAILURE CAN OCCUR DURING ENGINE OPERATION.

            With the trimming blade, carefully remove remaining maskant from the edges or surfaces to be plated. Make sure that you do not cause scratches or damage to the surface of the part.

         3. Do the subsequent procedure to clean the part after selective removal of maskant.

            1. Use a cloth that is wet with a solvent from SPM TASK 70-11-26-300-503 to wipe (rub) clean the surfaces from which the maskant was removed.

            2. Use CoMat 02-008 PUMICE POWDER and a cloth to clean those areas from which the maskant was removed.

            3. Remove remaining pumice powder with a clean cloth or blast of dry air.

      3. Examine the areas to be processed for cleanliness and total removal of maskant. If unsatisfactory, do again the above procedure to clean the part after selective removal of maskant.

      4. Do a check for nicks, tool marks, corrosion, or other damage to the surfaces to be plated.

   5. Procedure to remove the chemical maskant.

      1. 

         CAUTION

         IF YOU SCRATCH OR DAMAGE THE SURFACE OF THE PART, PART FAILURE CAN OCCUR DURING ENGINE OPERATION.

         Carefully cut and peel the maskant from the part with a trimming blade or by plastic blasting. Refer to SPM TASK 70-12-07-120-501. Make sure that you do not cause scratches or damage to the surface of the part.

      2. Remove the remaining maskant by one of the procedures that follow:

         1. Use a cloth that is wet with a solvent from SPM TASK 70-11-26-300-503 to wipe (rub) clean the part.

         2. Use CoMat 02-008 PUMICE POWDER and a cloth to clean the part.

      3. Examine the part for full removal of the maskant.

   6. Preserve the part, if protection of the part from rust or corrosion is necessary. Refer to SPM TASK 70-38-05-380-501.

8. SUBTASK 70-38-24-380-006 Apply Waterborne Maskant

   
   CAUTION
   WEAR CLEAN COTTON GLOVES WHEN YOU TOUCH THE PARTS AFTER CLEANING AND BEFORE MASKING.
   
   CAUTION
   WHEN CURRENT IS APPLIED TO A PART DURING STRIPPING OR PLATING PROCESSES, IT IS IMPORTANT TO KEEP AN ADEQUATE AREA OF POSITIVE CONTACT TO PREVENT POSSIBLE BURNING.

   NOTE

   Parts must be clean, fully dry and at approximately room temperature before masking.

   1. Degrease the parts. Refer to SPM TASK 70-11-03-300-503.

   2. 
      CAUTION
      PARTS MUST BE CAREFULLY MASKED TO PREVENT STRIPPING THE PLATING FROM OTHER AREAS OF THE SAME PART.

      NOTE

      1. If you mask the part made from materials that will corrode in the shop air, do not permit too much time to pass before you do the repair operation because the surfaces will corrode before you do the procedure.

      2. It is necessary to apply three layers of the maskant to all surfaces for satisfactory protection. The application procedure is the same for each of these layers. All surfaces to be masked must be clean and each have no oil or grease on them.

      3. CoMat 02-226 WATERBORNE MASKANT must have a viscosity of 3000 CPS as determined by a Brookfield viscometer at 20 RPM with a No. 4 spindle.

      This water-based material is a sufficient maskant for nickel plating (SPM TASK 70-33-05-300-503, SPM TASK 70-33-06-300-503 and SPM TASK 70-33-66-300-503) or electroless nickel plating (SPM TASK 70-33-08-300-503 and SPM TASK 70-33-25-300-503). It is not recommended for chromium plating (SPM TASK 70-33-02-100-501).

      Apply CoMat 02-226 WATERBORNE MASKANT by Step or Step as follows; then, go to Step.

      NOTE

      This layer of maskant must have the same thickness over the total area.

      Do not brush the same area again and again.

      1. Apply a thin layer of CoMat 02-226 WATERBORNE MASKANT to the specified areas by spray or paint brush.

      2. Apply a thin layer of CoMat 02-226 WATERBORNE MASKANT by immersion.

         1. Immerse and remove the parts at a rate of 0.5 ft./min to 1.0 ft./min (0.152 m/min to 0.304 m/min).

         2. NOTE

            If you use the slowest immersion rate, you will get a satisfactory thickness.

            The first layer must be as thin and equal in thickness as possible over the total area.

            NOTE

            Maskant must be equally dry at the end of this time. The color must change from a light blue-green to a darker blue-green. If there are wet areas remaining, increase drying time, as necessary, to be sure that all areas are equally dry.

      3. Dry the part at room temperature for up to one hour, or, to decrease the drying time, put the part in front of heat lamps or in an air flow oven at 160 deg F to 185 deg F (71 deg C to 85 deg C) for 10 minutes.

      4. Do step B. (1) or (2) again, as applicable for a total of three layers. If the maskant is thin on the corners, apply a fourth layer to give more protection to sharp corners. If necessary, add more layers.

      5. Examine the masked part for pinholes and bare spots before curing and, if necessary, apply more maskant to these areas.

      6. Put the part in an oven at 190 deg F to 200 deg F (88 deg C to 93 deg C) for at least four hours for the final cure.

      7. Scribe and peel the maskant from areas to be plated.

   3. Remove the waterborne maskant as follows:

      1. 

         CAUTION

         DO NOT USE THE BAKE METHOD FOR TITANIUM, TITANIUM ALLOY, ALUMINUM, OR HEAT-TREATED STEEL PARTS AS THIS WILL HAVE A BAD EFFECT ON THE MATERIAL.

         NOTE

         Do not scratch or damage the surface of the part.

         Carefully cut and peel the maskant from the part with a trimming blade or by plastic blasting (Refer to SPM TASK 70-12-07-120-501) or bake at 750 deg F (399 deg C) in air with the necessary equipment and approved controls.

      2. If necessary, put the part fully in hot water at 150 deg F to 200 deg F (66 deg C to 93 deg C) or put the part in front of heat lamps to make total removal of the maskant easier.

      3. Examine the part for total removal of the maskant.

   4. Preserve the part, if necessary. Refer to SPM TASK 70-38-05-380-501.