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AC 43.13-1B 9/8/98 marks will be noticeable in the finish. With increasing environmental concerns, high pres sure airless and high-volume low-pressure (HVLP) paint spray equipment is recom mended over conventional siphon and pressure pot spraying equipment. High pressure airless and HVLP paint spraying equipment will greatly reduce paint over-spray and fogging. A spray gun, single coat is applied by overlap ping each consecutive pass 50 percent of the fan width. A double coat is applied by re peating the coating application in the same di rection, or at a 90°€angle to the first coat (cross coat) before the first coat has flashed off or dried dust free. For safety and helpful tips for doping, see tables 2-3 and 2-4. TABLE 2-3. Safety tips for dope/paint. SAFETY TIPS. Always ground the aircraft structure while sanding and painting. Do not use an electric drill as a dope/paint mixer. Wear leather-soled shoes in the dope/painting area. Have an adequate, approved ventilation system. Wear cotton clothes when doping or painting. Wear an approved face mask or respirator when spraying. Follow all the manufacturer’s instructions. TABLE 2-4. Tips for doping. HELPFUL TIPS FOR DOPING. Limits for optimum application of dope: relative hu- midity 20 to 60%; temperature range 65° to 75 °F. Drying time will vary with temperature, humidity, amount of thinner used, and whether or not retarder was added to the mixture. Do not recoat until the surface is completely dry and all active solvents have left the dope film. Spray all coats except the first three or four clear coats, to avoid brush marks. Over thinning is preferred to under thinning. Addition of retarder will produce a smoother coat, but drying time between coats will be extended. Remember to always bring the dope to room temperature before using. Rubbing compound and wax polish may be applied after all solvents have escaped (usually 2 weeks, depending upon the weather). 2-21. DOPE APPLICATION PROCE- DURE (Natural Fabrics). a. Step 1. After the cotton or linen fabric is installed in accordance with the procedures specified in paragraphs 2-7 and 2-8, the fabric is wetted with distilled water to remove wrin kles and fold creases, which will show in a gloss finish. Water may be applied by rubbing with a clean sponge or rag, or by using a paint spray gun. Do not use tap water. It may con tain minerals which will contaminate the fab ric. (1) As water is absorbed by the fibers, the threads swell, resulting in temporary tauting of the fabric panel. The fabric should be allowed to dry before dope application, oth erwise the water in the fibers will interfere with the dope penetration and adhesion. (2) After the fabric has dried, the first coat of dope is applied, brushing in one direc tion to set the nap with a clean, non-shedding, 2-to 6-inch wide, semi-soft, long bristle paint brush. (3) To offset the deteriorating effect of mildew or other fungus on natural fibers, espe cially in damp climates, it is recommended that a fungicide be added to the first coat of dope. The preferred fungicide is zinc dimethyldithio carbamate powder, which should be prepared per the manufacturer’s instructions. If no manufacturer’s instructions are available the zinc powder may be stirred in at a ratio of 4 ounces, to one gallon of un-thinned nitrate or butyrate dope, after the powder is wetted to a paste with a 50/50 ratio of dope and thinner. (4) Pre-mixed fungicidal dope, manu factured in accordance with the formula speci fied in MIL-D-7850, will have a transparent purple tint to indicate the fungicide additive. Dope manufactured with other colors to To get a clean line for the trim colors, apply a light coat of clear dope directly on the masking tape prior to painting. This will help eliminate the trim color from running under the masking tape. Page 2-26 Par 2-20PDF Image | AFS-640
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