TASK 70-43-22-380-014
1 . General.
A.Epoxy is an erosion resistant, protective coating C03-010   and an effective coating for aluminum and ferrous materials, for use in areas subject to corrosion. To apply this coating to composites, refer to TASK 70-43-27-380-001, Paint - Epoxy and Polyamide Coating for Composites.
2 . Materials.
Subtask 70-43-22-380-141
 
Description
Consumable Code
 
Primer, Epoxy
C03-007  
 
Primer, Epoxy (A50TF311, Class A)
C03-086  
 
Paint, Epoxy
C03-010  
 
Reducer, (MIL-T-81772) Type II
C04-029  
 
Solvent, General
C04-001  
 
Solvent, General
C04-003  
 
Solvent, General
C04-035  
3 . Procedure.
Subtask 70-43-22-380-142
A.Strip old paint or other residues as prescribed by the Engine/Shop Manual repair.
WARNING:
CLEANING SOLVENTS ARE TOXIC AND HIGHLY FLAMMABLE. USE IN A WELL-VENTILATED AREA, AND TAKE PRECAUTIONS AGAINST FIRE.
(1)If parts have been inspected/repaired after paint stripping, vapor degrease in accordance with, TASK 70-21-02-110-002, Cleaning Method 2 - Vapor Degreasing, or hand clean with a paper wipe moistened with general solvent C04-001  , C04-003  , C04-035  , or equivalent. Allow part to dry completely.
(2)Mask all areas that are not to be painted, following detailed part instructions.
(3)Dry abrasive (grit) blast in accordance with TASK 70-21-04-120-001, Cleaning Method 4 - Dry Abrasive Blast Cleaning, using aluminum oxide grit in the 120-220 mesh range as an abrasive. Remove residual grit by blasting with clean, dry air.
NOTE:
Do not handle prepared parts with bare hands. Use clean, white, cotton gloves. If parts are not to be coated within 4 hours after cleaning, they should be stored in clean, sealed polyethylene bags.
WARNING:
PRIMER C03-007   IS TOXIC AND HIGHLY FLAMMABLE. KEEP AWAY FROM HEAT OR OPEN FLAME. USE IN A WELL- VENTILATED AREA AND WEAR A SUITABLE RESPIRATOR. AVOID SKIN CONTACT OR PROLONGED BREATHING OF THE VAPOR. IF THE PRIMER CONTACTS THE SKIN, WASH THE CONTACTED AREA WITH SOAP AND WATER IMMEDIATELY. IF IT CONTACTS THE EYES, IRRIGATE AND SEEK MEDICAL AID AT ONCE.
(4)Apply primer C03-007   or C03-086  .
NOTE:
Primer C03-007   is stored in a freezer.
(a)Remove C03-007   primer from the freezer and allow to come to room temperature before opening the container. The C03-086   primer may be stored at room temperature.
(b)Mark the time and date that the primer was removed from the freezer on the outside of the container for the C03-007  .
NOTE:
The shelf life of the C03-007   material is seven days at room temperature. This material cannot be refrozen after the shelf life has expired.
(c)Mix the primer in its own container according to manufacturer's instructions.
(d)Check the spray gun for cleanliness and the air hose to be sure that there is no oil or water contamination.
(e)Pour the mixed primer into the spray gun cup using a funnel strainer. Adjust the air pressure for the best spraying results.
(f)Spray primer for 100% coverage of part. Primer thickness is to be approximately 0.0004 inch(0.010 mm) - a very light haze.
(g)Allow the part to air dry for 30 minutes minimum.
(h)Cure the primer as follows:
1Preheat an oven to 250°F ± 10°F (121°C ± 6°C).
2Place the part in oven and cure for 60-90 minutes at 250°F ± 10°F (121°C ± 6°C).
3Allow the part to cool to 150°F (65.5°C) maximum.
(5)Apply epoxy coating C03-010  .
NOTE:
Prior to painting, part must be clean and dry.
WARNING:
CLEANING SOLVENTS ARE TOXIC AND HIGHLY FLAMMABLE. USE IN A WELL-VENTILATED AREA, AND TAKE PRECAUTIONS AGAINST FIRE.
(a)Surface to be painted may be cleaned with a paper wipe moistened with general solvent C04-001  , C04-003  , C04-035  , or equivalent. Allow the part to dry completely.
(b)Mask all areas that are not to be painted, following detail part instructions.
(c)Mix each individual component in its original container. Mix the base and the curing solution as specified by the manufacturer. Stir thoroughly and allow this mixture to stand at room temperature for 30 minutes minimum (chemical reaction time).
NOTE:
This waiting period will apply after the addition of reducer (C04-029) if reducer is required.
NOTE:
Thinning the material up to a 90% paint/10% reducer mixture is the recommended range.
(d)Spray the paint in repeated thin coats to produce a satisfactory surface finish of 0.003-0.005 inch (0.08-0.13 mm).
WARNING:
MAKE SURE THE PAINT IS DRY BEFORE YOU PUT THE PARTS IN THE OVEN. WET PAINT CAN START A FIRE OR AN EXPLOSION.
(e)Air dry painted parts for 30 minutes minimum.
(f)Oven cure at 130°F ± 10°F (54°C ± 6°C) for 30-60 minutes.
(g)Remove all masking and clean as required.