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epoxy from ultraviolet light and require proper preparation of the surface before applica- tion. Preparation for the final finish is just as important as it is for re-coating with epoxy. The surface must first be clean, dry and sanded (Section 5.4.1). 1. Allow the final epoxy coat to cure thoroughly. 2. Wash the surface with a Scotch-briteTM pad and water. Dry with paper towels 3. Sand to a smooth finish. If there are runs or sags, begin sanding with 80-grit paper to re- move the highest areas. Sand until the surface feels and looks fair. Complete sanding with the appropriate grit for the type of coating to be applied. Generally, the thinner the coating, the finer the grit. Paint adhesion relies on the mechanical grip of the paint keying into the sanding scratches in the epoxy's surface. If a high-build or filling primer is to be applied, 80–100-grit is usually sufficient. For primers and high-solids coatings, 120–180-grit may be adequate. Finishing with 220–400-grit paper is often recommended for coatings with high-gloss finishes. Grits finer than this may not provide enough tooth for good adhesion. Follow the coating manufacturer’s recommendation for surface preparation. Wet sanding is preferred by many people because it reduces sanding dust and it will allow you to skip Step 2. Wet sanding is often used for final sanding after an initial machine sanding with a coarse grit. 4. After you are satisfied with the texture and fairness of the surface, rinse the surface with fresh water. Rinse water should sheet evenly without beading or fish-eyeing. If rinse water beads up (a sign of contamination), wipe the area with solvent and dry with a paper towel, then wet sand again until beading is eliminated. Proceed with your final coating after the surface has dried thoroughly. To reduce the possi- bility of contamination, it is a good idea to begin coating within 24 hours of the final sand- ing. Follow all of the instructions from the coating system’s manufacturer. It may be a good idea to make a test panel to evaluate the degree of surface preparation required and the compatibility of the finish system.n Using WEST SYSTEM® Epoxy 47 5PDF Image | Vacuum Bagging Techniques 002150
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