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D. Miscellaneous tools including brush or nonatomizing spray, stiff bristled brush, clean cloths, squeegee or plastic scraper and proper protective clothing.
3. Application of Stripper
A. Brush or spray liberal amounts of well-mixed stripper on painted surface. If using brush, apply in one direction only instead of brushing back and forth. If spraying, use nonatomizing spray.
NOTE: The surface should be kept moist with stripper and the area being stripped should not be larger than can be reasonably worked.
B. Allow stripper to set undisturbed, but kept moist, until paint is completely loosened.
NOTE: This process may take between fifteen minutes and two hours, according to the type of paint being stripped. Usually the paint will wrinkle when loosened, but some paints do not wrinkle and should be tested for looseness by scraping very gently with a blunt wooden stick. Care should be taken to avoid damage to the skin while doing this.
C. Remove old paint and examine surface.
NOTE: If stripping is incomplete, fresh stripper should be reapplied and the surface kept moist with stripper while stubborn areas are scrubbed with a stiff bristled brush. Stripper should only be applied to a surface that is free of water.
D. Remove all excess stripper and loosened paint with squeegee or cloths.
E. Apply pressure water rinse followed by solvent alkaline cleaning.
NOTE: Residual soils may be cleaned with butyl cellusolve solvent.
F. Apply proper surface treatment in preparation for finish to be applied.
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4. Solvent Stripping MIL-C-7439 and MIL-C-27315 Rain Erosion Coating from Fiberglass
A. Moisten cloths in toluene and place over coating, allowing to stand until coating wrinkles. Apply more toluene to keep cloths moist if necessary.
B. Peel coating off.
CAUTION: DO NO ALLOW TOLUENE TO CONTACT FIBERGLASS AREAS FOR LONGER THAN 2 HOURS.
C. Lightly sand surface with abrasive paper (240 grit or finer) and solvent clean with xylene.
F85280
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51-21-11 Figure 701 Oct 20/85
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PREPAINT CLEANING AND PRETREATMENT - CLEANING/PAINTING
1. General
A. This section describes airplane surface preparation prior to application of exterior decorative finishes. The specific paint system section governs sequencing and selection of procedures in this section.
WARNING: STRIPPERS, CLEANERS, AND SOLVENTS USED IN THIS SUBJECT CONTAIN TOXIC AND FLAMMABLE COMPONENTS. AVOID BREATHING VAPORS AND MIST. USE WITH ADEQUATE VENTILATION. PROVIDE APPROVED RESPIRATORY PROTECTION AS REQUIRED. DO NOT GET IN EYES. AVOID CONTACT WITH SKIN AND CLOTHING. USE PROTECTIVE EQUIPMENT AS REQUIRED. KEEP FLAMMABLE MATERIALS AWAY FROM SOURCES OF IGNITION.
2. Equipment and Materials
A. Solvents
(1) Solvent - Final Cleaning of Metal Prior to Painting (Series 84) (Ref AMM/SOPM 20-30-84)
B. Stripper (Ref 51-21-11, Paint Stripping)
C. Cheesecloth
D. Abrasives (Ref 20-30-51)
(1)
Silicone carbide paper - 180 to 320 grit
(2)
Scotchbrite pads
(3)
Wooden or plastic scrapers
(4)
Aluminum oxide abrasive paper - 150 grit or finer, 240 grit or finer, 400 grit or finer
E. Alodine 1000 or Alodine 1200 (Ref 20-30-41)
F. Tack rags
G. Static Conditioner - 28-C-1 (Ref 20-30-41)
H. Surfacer - 8-W-5 (Ref 20-30-41)
(1)
Hardener - 50-C-3 or 10-C-32
(2)
Reducer - 66-C-28
3. Prepaint Cleaning
A. Mask or protectively cover all areas not to be contacted by solvents, cleaners and Alodine.
B. Do not abrasive clean anodized surfaces that are not to be painted.
C. Remove temporary protective coatings, if applied.
D. Remove residual coatings according to 51-21-11, Paint Stripping. If necessary, use wooden or plastic scrapers, sandpaper or Scotchbrite pads as aids in removing the contaminants. Do not allow paint strippers to contact fiberglass, aluminized fiberglass, acrylic windows or sealant fillets.
E. Remove stripper residue, loose dust and water soluble contaminants by spraying with hot water, 135 to 145°F, 10 to 20 gpm per station. Refer to 51-21-11, Paint Stripping, also.
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