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post #5 of Old 04-11-2013
pauloman
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Re: Painting right over gelcoat, no sanding necessary

gel coat is just thickened and pigmented polyester/fiberglass resin.

Easy to paint. But the real issue is UV damage which has broken down the resin and make for a chalking - porous - not good bonding surface. The fix is a solvent thinned eopxy primer like esp 155 which will firm up the surface and provide a good, fresh bonding surface.
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