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That is what it looks like to me also, etching is something no body seems to do, I do a 2 part, metal cleaner and then a conversion coating with metal conditioner ( I think it is phosphoric acid). I chemically strip everything that has been repainted, if it is original paint you can not get a better substrait. I have been restoring cars 43 years and have never had a come back because of problem with primer over bare metal, and yes I do use epoxy primer before primer surfacer, but in the old days I never had a problem using red oxide or grey lacquer type primers as long as it was etched. In your case if you are in a high humidity area that could be a issue or if the air compressor was not purged it could cause the same problem even if epoxy primer was used. Steve
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