yeah you could use epoxy resin but you still need to apply a final coat of the epoxy resin or paint to finished fiberglassed surface to seal it. If you use polyester resin you'll need to apply some kind of epoxy pant to seal it. Basically the same deal, however I believe the epoxy resin will stick better to wood and last longer.
I do know that fiberglass can rot if not properly protected so I'm assuming something is needed.
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