Hello Steven
It is unusual but not unheard of for a reaction between epoxy and a modern paint. To help us understand the problem can you tell us.
:The brand of epoxy and if it was fully set before you applied the paint.
:Is the paint water or oil based. (as Eric says this will make a difference)
:Did you brush or spray the paint (if sprayed what was the percentage of thinners to paint)
With the answers to these questions we will be able to assess the problem and hopefully give you a solution.
Paul