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In response to item #4 it seems like a good idea to wet the areas about to be re foamed as it will add a little strength as well as adhesion. I assume the foam you are using is pretty sticky on its own, but the coat of resin might also fill tiny cracks you can't see. I am sure you know this but for others, layup resin will remain tacky forever until you deprive it of air so the foam need not be installed while resin is curing.