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9/8/98 AC 43.13-1B (c) When two fabric surfaces are to be bonded, apply two coats of extra light ce- ment, two coats of light cement, and three coats of heavy cement to each surface. Rubber- coated tape and seam crossover patches with protective backing do not require cement. Each coat of cement should be thoroughly dry to the touch before the next coat is applied. Start the bonding of fabric surfaces while the last coat of cement is slightly tacky. To ensure proper adhesion when bonding two cemented sur- faces, the areas to be bonded should remain tacky during application. This is accomplished by brushing the cemented area with a cloth moistened with solvent. NOTE: If difficulty in the drying of heavy cement is encountered due to atmospheric conditions, six additional coats of light cement may be substi- tuted for the three coats of heavy ce- ment. (d) After applying the patch, thor- oughly roll it with a hand roller, rolling from the center to the outer edge, to ensure that all air pockets are removed and a firm bond is se- cured. (e) Thoroughly dust with talc. Allow to cure for 60 hours before performing leak tests and storing. (2) Inside Patches. (a) Cut a rectangular patch as shown in figure 9-13, allowing at least 1-1/2 inches to extend beyond the edge of the injury in all di- rections. (b) Mark the center line on the side of the patch that is to be attached to the raft. Mark cross lines on each end of the patch 1-1/2 inches from the ends. When the patch is applied to the injury on the inside, the longitu- dinal edges of the injury will coincide with the center line, and cross lines on the ends of the patch will coincide with the ends of the injury. (c) To ensure that the inside surface of the raft is properly powdered in the area of repair, pass a small handful of talc through the opening in the raft and place it approximately 12 inches from the injury. This should be ac- complished before the inside area is cemented, exercising care to prevent distribution of the talc prior to completion of the repair. FIGURE 9-13. Repair dimensions. (d) Using cleaning solvent, cleanse an area on the inside surface of the fabric slightly larger than the patch to be applied. En- sure that the repaired area is thoroughly dry, both inside and outside; apply two coats of extra light cement, two coats of light cement, and three coats of heavy cement (or six addi- tional coats of light cement in lieu of the heavy cement) to the cleansed area, allowing each coat to dry thoroughly before applying succes- sive coats. NOTE: Since it is impossible for the repairman to visually observe the ce- menting that is being accomplished on the inside of the raft, exercise care to ensure that each coat of cement com- pletely covers the area to be repaired. Par 9-42 Page 9-33PDF Image | AFS-640
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