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the same size as the bottom of the cavity at the inside of the bevel. The combined thickness of the layers when compressed should be slightly thinner than the laminate that was exca- vated. 4. Prepare the vacuum bagging materials. Cut release fabric, perforated film and breather slightly larger than the repair area. Cut the vacuum bag several inches larger on all sides than the repair area. Apply mastic sealant several inches outside the perimeter of the repair area. 5. Wet out the repair area with a resin/hardener mixture. Apply a thin layer of thickened ep- oxy/404 mixture to the repair area to fill any voids or unevenness. 6. Apply the wet-out layers of cloth beginning with the largest layer and then with the pro- gressively smaller layers centered in the repair area. Wet out each layer of cloth on a plastic covered table, then smooth each layer in place on the repair area, removing air bubbles and excess epoxy with an 808 Plastic Squeegee. 7. Squeegee the layer of release fabric over the layers of cloth to remove any trapped air and excess epoxy. Place the perforated film and breather material over the lay-up and seal the vacuum bag to the mastic. If necessary on vertical surfaces, hold the breather material in po- sition temporarily with tape. 8. Attachthevacuumportofftothesideoftherepairifpossibletoavoiddimplingtherepair with the vacuum port. 9. Turn on the vacuum pump and attach the vacuum gauge. After the vacuum has stabilized, moderate heat from a heat lamp or portable heater may be applied to the lay-up to speed the cure. Allow the lay-up to cure thoroughly and remove the bag, breather, perforated film and release fabric. 10. Grindanyhighspotorbumpsandfillanylowareaswithathickmixtureofepoxyand407 filler. Sand the repair area fair after the mixture cures thoroughly and apply two coats of epoxy to seal the repair. Apply paint or gelcoat for UV protection. For more information about fiberglass repair, refer to 002-550 Fiberglass Boat Repair & Maintenance available from WEST SYSTEM. 4.5 Resin infusion and VARTM There are several methods of laminating parts that use a vacuum bag to consolidate the laminate and seal the mold, and use the vacuum pressure to draw resin in to the dry lami- nate stack. In these processes, rather than wet laminate being placed in the mold, the vari- ous fibers, and perhaps even a core, are placed in the mold dry. The vacuum bag is sealed to the mold and vacuum drawn. Once the full vacuum pressure is applied and no leaks exist, resin and hardener are mixed, then drawn into the laminate, much like a soft drink is sucked through a straw, and allowed to gel. This is a simple description of a somewhat complicated process. The details can take some time to work out. Very good vacuum bagging skills are required for these techniques be- cause leaks cannot be tolerated in these processes. For more information concerning these processes, refer to Professional Boatbuilder magazine, or American Composites Manufac- turers Association’s (ACMA) Composites Fabrication magazine for reprints of articles on these techniques. Vacuum Bagging Applications 29 4PDF Image | Vacuum Bagging Techniques 002150
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