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> What is the problem with the UV and epoxy? Its OK to use it as a primer, but
>  not as a top coat?

Epoxy coatings make an excellent primer but is by their nature are 
susceptible to UV light. If you put an unprotected epoxy coat out in the sun 
for a while you will start to get powdery coating on it that looks like 
chalk. This is the epoxy starting to break down. Urethanes on the other hand 
are very UV resistant so are used as a top coat. But, urethanes do not make 
good primers. So use an epoxy primer and protect it with a urethane.

Pete Johnson
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