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yes when we were only using lacquer base products they did stick to bare metal substraights . the big reason for that was that the primers back then had a alkaline base to them . there is also the fact that ferromagnetic ( red oxide ) is a iron base product . iron will bite into it's self ( the metal substraight ) .
the old gray lacquer primers would bite into metal but not as good as a a red oxide would . the main reason is that there was no iron oxide in the gray primers there was only a alkaine . alkaline is a acid the down side to the old products is health .
with the panels in this post i would guess that the hole panel was not stripped to bare metal but only were there was a chip or other imperfection that needed to be sanded out . but like always it's hard to tell from a photo .
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