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One more thing!! I just noticed that you said you used a thin layer of acrylic PAINT not acrylic GESSO. Is that correct? If so, this could be the problem although I'm not certain of the mechanism. There is a school of thought that says you should not paint with oils over acrylic PAINT because it will not form a proper bond. If there is some truth to that, perhaps that is the root of the problem.
On an aluminum panel, you shouldn't need a primer other than a layer of white paint if desired because I don't not think that aluminum oxidizes. If it does, it doesn't discolour as copper does. A thin layer of acrylic gesso would work fine, too.
Juan
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