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because you realy have offered no info other than colors it would be very hard to say for sure but my guess would be it's just an e-type primer . epoxy or etch .
i have stated this many times in the past any bare metal spot bigger than the size of a US QUARTER DOLLAR . you will want to spray a coat of E-primer down 1st .
the copper is most likely a weldable zinc primer . you would only want that were there is two or more panels that come together and over lapping .
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