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Paul,
a few things I know of may cause that problem and the fact that you are using rattle cans narrows it down even more. I'd say you are either...
-Laying your paint on too thick. most paints dry from the substrate out to the surface. Spray paints are designed to dry quickly so, if the paint is really layed on there the surface will dry while the paint closer to the plug will remain soft and full of solvents. As the solvents make their way out they will force the epoxy to let go.
-Not allowing enough time between coats of paint. For the same reasons listed above, if paint is not given ample time to dry before being recoated it will hold its solvents and lift the clear.
-Scuffing may also help as Scott suggested, but I don;t believe scuffing alone will solve that problem. Usually adhesion problems will not become apparent right away.
It sounds like solvents are trapped and affecting the cure of the epoxy.
Hope this helps... use light coats and follow lable directions for dry time, recoat time and application.
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