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1. Prepare the materials to be laminated. Cut fabrics, ve- neers and core materials to shape and place them in a convenient area for wet-out or placement in the mold. Cut the release fabric, perforated film (if required), breather material and vacuum bag to size, then roll or fold them and placed them in a convenient location. Cut the vacuum bag 20% larger than the mold dimensions. 3. Apply a coat of gelcoat to the mold and allow it to cure. In this example, the gelcoat is a mixture of resin/hardener and white pigment, thickened slightly with 406 Colloidal Silica. It will provide a good base for paint and help prevent “print-through” of the fabric. Wash the surface of the cured gelcoat with water and an abrasive pad to remove any amine blush that may have formed on the cured surface. See Section 5.4.1, Surface preparation—cured epoxy. Dry the surface thoroughly with clean paper towels. Sand bumps or rough areas to assure the laminate will lie flat in the mold. 2. Apply the appropriate mold release to the mold and shelf surfaces. Follow the manufacturers directions for application. If you are using paste wax buff the last coat so excess wax will not be picked up by the laminate. 4. Apply mastic sealant to the mold perimeter. Use firm pressure and overlap the ends so there are no gaps. Leave space around the laminate area and keep the paper back- ing in place on the mastic so it will not become contami- nated with wet epoxy. It is nearly impossible to seal the bag to wet mastic. Vacuum Bagging Applications 17 4PDF Image | Vacuum Bagging Techniques 002150
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