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2. Vacuum bag can be reused many times. Cut the vacuum bag tube at least a foot longer than the longest part of the wing that is to be bagged. Bag clips are used to seal the ends of the bag at desired lengths. Throughout this entire process, the Nylon bag should be handled careful to prevent having holes on it. 3. Mylar film should be cut to two pieces that covers almost the exact area of top and bottom of the wing, about 1⁄2 in from the leading edge. Try not to scratch or put any gauges on the Mylar because any of the defects will be transferred to the wing later on. Tape the trailing edges of the Mylar together to make a folding layer. Clean the inside surface of the Mylar and with paper towels, apply release wax all over the surface. Rub some of the wax along the outer edge of the other surface as well. This prevents the excess resin from sticking and allows the Mylar to be reused. 4. Cut breather strip about a foot longer than the foam core wing that you are using. 5. Cut the release film to almost the size of the wing area, top and bottom. 6. Cut the fiberglass cloth to match the surface of the taped Mylar combined. All the materials prepared above should be at least a foot shorter than the Nylon bag. 7. Epoxy and resin hardener mix (usually West System 105 Epoxy Resin and 205 Hardener) should be prepared the last due to its curing time that allows limited working time. The fast hardener should allow a working time of about 30 minutes in room temperature. Higher ambient temperature makes the epoxy cure faster. Further reading and http://www.westsystem.com/ss/epoxy-chemistry. understandings of epoxy cure time can be done on Dispense the proper proportions of resin and hardener into mixing cup. One squirt of resin for one squirt of hardener. Do not try to adjust the mix ratio. Do not use glass or foam containers because of potential danger from exothermic heat build-up. Stir the two ingredients together thoroughly-at least 1 minute-longer in cooler temperatures. To assure thorough mixing, scrape the sides and bottom of the pot as you mix. Use the flat end of the mixing stick to reach the inside corner of the pot. Revision: Original Release 10/31/15 Page | 4PDF Image | Vacuum Bagging Wings Instruction Manual Purdue Univ
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