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I saw another identical test on another board using most of the paints you mentioned, and the 2 paints that came out the best, over time, both submerged underwater in a old swiming pool, and exposed to the elements were POR-15, and rustoleum.



Glad you brought that up. I'd really like to seal my heap from the tin worm, and I like the way POR-15 performs, but have been told for years that regular shops won't paint over it for adhesion problems.

My plan was to coat a panel with Por-15 and then test various topcoats. This roller method makes this process an order of magnitude easier to accomplish in the home garage.

Not to hijack the thread, but has anyone had experience topcoating por-15? Any tips for the newbie?