Plywood bench seats ? I replaced mine on an older 16 foot Lund Great Lakes Edition with best clean sided plywood that I treated with Thompsons waterproofing. I found I had to replace 99 percent of the stainless steel screws and bolts . Not cheap but messing with the old ones were a p.i.t.a. !
I have had good success with spar varnish. Best side of exterior grade plywood, as mentioned above, routered the edges and sanded. I would imagine that a tinted deck sealer would also yield the desired results. Sand well between coats to knock down any roughness.
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