Should be ok IF the epoxy bonds well and stays intact. Might be worth using an etching primer and applying a couple coats of epoxy on the bottom. I painted my tank with a zinc chromate/epoxy primer from Sears when I got the boat in 1975. I pulled the tank to inspect it and replace hoses when I repowered in 2006 and it was still in good shape. But whatever you do, DON'T foam in the tank!
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