Join Date: Jun 2012
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Re: plywood type for fiberglass .
I'd use two layers of 1/2" Oak Plywood glued and bolted together then fiberglassed. Buy the small 2'x2' pieces and it'll cost about $18, Cut the perimeter after gluing together so you have no overhangs between the pieces and the fiberglass will uniformly adhere to the edges. Glass cloth doesn't go around the corners well so initially epoxy the whole thing with no glass to ensure watertightness.