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9/8/98 AC 43.13-1B 1-70. FINISHING WITH FABRIC OR TAPE. A number of systems for exterior fin- ishing have STC approval and are manufac- tured under a PMA. Follow the product manu- facturer's instructions for the system used. a. If the finish surrounding the repair is a traditional dope system, seal the wood grain with a suitable solvent resistant one-part var- nish, commonly described as “dope proof,” or a two-part epoxy varnish. Follow with two coats of clear dope, and allow sufficient drying time between coats. b. Apply a third coat of clear dope and lay a piece of pinked-edge airplane cloth into the wet film. All air bubbles should be worked out by brushing to ensure maximum adhesion. When dry, apply one brush coat, to ensure proper penetration, and at least one spray coat of clear dope. The dried spray coat may be sanded with fine sandpaper to obtain a smoother finish. Complete the refinishing of the surface by application of a topcoat as re- quired to match the adjacent area. 1-71. SEALING OF BOLT HOLES. Bolt holes in wooden structure provide a vulnerable entry point for moisture. Variations in mois- ture content around bolt holes can lead to de- cay or splitting. In addition, excessive mois- ture at bolt holes promotes corrosion of the bolts. Sealing of the wood surfaces in bolt holes can be accomplished by application of varnish or other acceptable sealer into the open hole. The sealer must be allowed to dry or cure thoroughly prior to bolt installation. 1-72.1-79. [RESERVED.] Par 1-70 Page 1-37 (and 1-38)PDF Image | AFS-640
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