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I'd do them with something like westsystem epoxy, especially the exposed end grain. The bare wood will soak it right in. If you want a really smooth surface, you'll then have to sand lightly and apply another coat. It'll last forever, clean up easy if necessary, and waterproof the wood. BTW, any holes you drill or cut in fiberglas or wood should get a coating of epoxy on the portion cut as it opens the interior of both materials to the damaging effects of water.
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