Something is in the paint or on the plugs that interferes with the adhesion of the epoxy. I had major problems with this last year, I couldn't get System three clear coat epoxy to stick to Krylon clear. Either change your paint, or change your epoxy. Be sure your plugs are clean (don't handle after painting or wipe with alcohol), be sure there isn't silicone (release agent) in what ever you are mixing your epoxy in/with.
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