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Crazing in the cockpit coaming of a 1983 J29 often results from a resin-starved initial layup during the boat's original construction, where the gel coat lacks a stable substrate and the underlying chop strand matting prints through.5:01 To permanently repair this cracking before painting, sand the affected area down to the bare fiberglass to remove the brittle gel coat and the dry, unsaturated glass layer.9:01 Apply one or two layers of 1.5-ounce chop strand matting using laminating polyester resin in temperatures above 60–65 degrees Fahrenheit.9:38 Follow this with a layer of waxed gel coat to seal the fiberglass and provide a high-viscosity sanding buffer that creates a smooth surface without requiring excessive material removal.9:57 Once the surface is stable, use an epoxy-based fairing compound like TotalBoat TotalFair to minimize shrinkage before priming and painting.12:57 Two-part catalyzed paints offer superior chemical resistance and hardness compared to one-part paints, though they cost significantly more.14:33 Stabilizing the substrate with new fiberglass prevents the original crazing pattern from telegraphing through the final paint finish.

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