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AC 43.13-1B 9/8/98 NOTE: ASTM publication D1682 has been discontinued but is still referred to in some Aerospace Material Speci- fication (AMS). The grab test method previously listed in ASTM D1682, sec- tions 1 through 16, has been super- seded by ASTM publication D5034. The strip testing method (most com- monly used in aircraft) previously listed in ASTM D1682, sections 17 through 21, has been superseded by ASTM publication D5035. 2-35. REJUVENATION OF THE DOPE FILM. If fabric loses its strength, there is nothing to do but remove it and recover the aircraft. But if the fabric is good and the dope is cracked, it may be treated with rejuvenator, a mixture of very potent solvents and plasticiz- ers, to restore its resilience. The surface of the fabric is cleaned and the rejuvenator sprayed on in a wet coat, and the solvents soften the old finish so the plasticizers can become part of the film. When the rejuvenator dries, the surface should be sprayed with two coats of aluminum-pigmented dope, then sanded and a third coat of aluminum-pigmented dope ap- plied, followed with the colored-dope finish. When repairing, rejuvenating, and refinishing covering materials approved under an STC, in- structions in the manual furnished by the mate- rial supplier should be followed. 2-36.2-41. [RESERVED.] Page 2-36 Par 2-34PDF Image | AFS-640
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