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AC 43.13-1B CHG 1 9/27/01 does not deteriorate glass fabric. Aluminum- pigmented dope blocks UV radiation and pro vides a sanding base. A gauge of ultraviolet protection in the field is to block all visible light from penetrating through the fabric. Drying time between the two coats should be at least 1 hour at 70 °F. (1) An option to premixed aluminum dope is to use aluminum-pigment paste. Alu minum paste should be prepared per the manu facturer’s instructions. If no manufacturer’s instructions are available, mix 3 ounces (by weight), of 325-mesh aluminum-pigment paste, to 1 gallon of unthinned, clear dope. The aluminum paste should first be mixed to a cream consistency with a 50/50 ratio of dope and thinner before mixing into the unthinned clear dope. A higher ratio of aluminum- pigment added to the dope may cause a loss of primer-coat and finish-coat adhesion, and peeling may occur especially when high tack tape is used to mask for the trim colors and registration numbers. (2) The viscosity of the mixed alumi num-pigmented dope should be adjusted for satisfactory spray gun application. h. Step 7. After two coats of aluminum- pigmented dope have dried at least 4 hours at 70 °F, the surface may be wet sanded with # 280 grit (or finer) waterproof sandpaper. The aluminum-pigmented dope should be sanded only to develop a smooth surface, not sanded completely off to the clear dope undercoats. Do not sand over screwheads, rib lacing, or any structural sharp edges that will quickly cut through fabric and require patching. Addi tional coats of aluminum-pigmented dope may be applied and sanded, depending on the final finish desired. The last coat should not be sanded to assure ultraviolet protection along the edges of the finishing tapes and reinforcing patches is maintained. i. Step 8. Three coats of pigmented color finish are applied with a paint spray gun, al lowing adequate drying time between coats. The color finish may be wet sanded between coats, if desired, with a fine grit waterproof sandpaper. Adding blush retarder to the final dope finish will improve the gloss. After dry ing several weeks, a rubbing compound may be used to buff the finish and increase the gloss. A periodic application of a wax polish will help protect the finish from the weather and environmental pollution. NOTE: Drain holes should be opened soon after all finishing is complete to insure drainage and to aid ventilation of the structure. (1) When exposed to the sun, dark col ors absorb more sun energy and convert that energy to heat more easily than light colors. High temperatures dry out wood structures and deteriorate organic materials in an aircraft structure. Preferably the lighter color shades are applied first and then overcoated with darker trim and registration number colors. (2) Only high-quality, solvent-resistant crepe paper or polypropylene masking tape should be used to avoid finish bleed under the tape edge. Newspaper printing ink may trans fer to a fresh finish and should not be used for masking paper. Plastic sheeting should not be used as a dust cover on a fresh finish due to possible bonding and damage. 2-22. COVERING OVER PLYWOOD. Exposed, stressed plywood surfaces, such as wings, must be protected from weather Page 2-28 Par 2-21PDF Image | AFS-640
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