As you can see I sandblasted a small patch. I stopped because of pits. They aren't extremely bad but I don't think a primer will fill them in. Maybe 2 coats of some thick primer would do it ???. I would say the deepest pit is 2/10ths of the thickness of the roof metal. Hundereds of tiny pits - I'm def not going to try and bondo them all! Would it be better to just treat the rust and let the rust fill in those pits and then throw some epoxy primer over it ?

This roof had a Fact-O-Bake single stage paint job over it. Over a ten year period it was fine, the rust did not come thru at all. This is understandable since it was sealed and no moisture was getting thru. So I'm thinking it's repeatable. Any thoughts ?


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if it was my car would use some sound deadening pads on the insdie of the roof panel for support and keep the roof from canning in....then i would bondo the entire roof panel and block it down! dont make it a huge thick coat do it one coat of bondo (builder and filler coat) then use a final top coat of polly fill which is a lightweight filler and that sould do it. but your gonna have to do something to reinfoce the roof from the bottom side to keep it from walking on you!