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Old 07-28-09, 05:46 AM
THE Materials Oracle
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You won't find a waterproof epoxy paint at all, and for two good reasons;

1.) There's no such thing as a waterproof plastic. End of.

2.) Epoxy system paints were originally developed to be the primer body for high-durability, extreme service applications, such as aerospace and marine, and by peopel who understood and accepted that all polymers no matter their thickness or chemistry allow water and gas transfer. Almost all aeospace calibre paints are epoxy primer based and that primer is not only porous, but the porosity is intentional. Strontium chromate and zinc-potassium chromate bearing films are laid down on top of aluminium, steels, magnesium and titanium alloys to cathodically protect the substrate but they cannot do that without being electically connected to both the substrate and the interface with the next paint layer.

The intention here is to put a hopefully, mostly waterproof, ish, barrier coat down on the top of this epoxy and once, eventually water has managed to get through it, then the primer/protection can do its job.

This said, epoxy undercoat primers are remarkably durable when properly topcoated. I can recommend Indestructible Paints for any of their systems. They sell mostly to industry, but you can deal with them in small quantities as a private purchasor if you don't mind paying for the best.
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