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Vacuum Bagging Applications 18 5. Place the first layer of two layers of 15 oz biaxial fi- berglass fabric in position in the mold. In this example, it is easier to wet out fabric in the mold after it is posi- tioned and trimmed. Once the epoxy is mixed, the time limit for the entire process is established, based on the hardener used, ambi- ent temperature, and the volume of laminate in the mold. When multiple batches of epoxy are used on larger lay- ups, apply full vacuum pressure before the first mixed batch reaches its initial cure. Refer to product literature for cure time information. 7. Place a layer of release fabric over the laminate. The release fabric will peel off the cured laminate leaving a fine-textured surface. Excess epoxy which has bled through will be removed along with the release fabric. 6. Squeegee excess epoxy from each layer of fabric after it is wet out. There should be no puddles of epoxy or air pockets under the fabric. Because fabrics are compressed when vacuum bagging, less epoxy is required. Properly wet out fabric may ap- pear drier than for a normal wet lay-up. When properly wet out, a puddle of epoxy will appear around the edges of a thumb print after a few pounds of pressure are ap- plied with a (gloved) thumb. 8. Place breather material over the release fabric. WEST SYSTEM 881 Breather Fabric is a polyester blanket that allows air to pass through its fibers to the port and ab- sorbs excess epoxy that passes through the release fabric. Press all of the layers of material into contact with the mold to avoid “bridging” when vacuum pressure is applied. See Section 4.2.1 4PDF Image | Vacuum Bagging Techniques 002150
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