About the paint thickness and bondo, we all like to buy a virgin so to speak, not a single dent in 40 years. They're rare. And I agree with PanteraDoug (maybe a 1st!) that a little bondo here and there is ok if the body man doing it was doing a good job. When I painted my Pantera there were maybe a square foot real bondo and also a thin layer of spray bondo over the rest since the paint was grinded off. It's unavoidable, and the factory did the same. I've heard Pantera owners claim that their Pantera had no bondo at all when they removed the paint, that's just ballony, steel is not so perfect in shape.
So I would use such a tool to try to find bad repairs, but if I found some bondo and maybe could see/feel from the inside that it was just a dent repair or a good rust repair, max 3mm thick maybe, I would not walk away.
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