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You can use any type of nontoxic water proof latex paint, but make sure it is totaly dry. A week to cure and totaly dry, would be best. If you use the water proof, then there is no need for a sealer, but you can seal the cracks with clear aquarium silicone. If you want to use the polyurethane, just keep in mind that it needs to be totaly dry, but I don't use it at all. The nontoxic water proof latex Has worked just fine for me.