I've used what I've been told is forming grade plywood with good luck, its the stuff with the red paint around the edges. Its not marine ply, but it doesn't cost like marine ply. resin seems to stick good to it, I redid the compartments on my Mitchell a few years back, that boat has been thru three owners since then, been used like a government mule. the work I did on it is still holding up last time I saw it
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