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Keep it simple. Epoxy on bare plywood. Sand it relatively smooth, then the glass, saturated in more epoxy. Sand this relatively smooth, add another coat of epoxy. Sand again. Coat with white epoxy primer to protect the epoxy from ultraviolet, to fill minor imperfections, and to make yourself feel that you are making some progress. When you are ready to paint, use the best paint you can afford. The linear polyurethanes made for marine use cost the most. Don't use epoxy finish coats as they will degrade due to ultraviolet quite fast. Use sand for nonskid, but only enough to provide one grain thickness, covered by several more coats of paint. Use rollers, squeegees or brushes for the epoxies. Use rollers and good brushes for painting. Follow directions for thinning paint. Don't try to "improve" on the epoxies. Use the wood that you have available. Jim Brown taught local fishermen to build their own boats using epoxy and weird local timber because that's what they had. Get it built, then, if you later discover that something doesn't work, try something else.
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