an isolated rust
spot could be from an accident repair. it is impossible to duplicate the factory prep and so often rust results from repairs. they will particularly show up at edges and ridges where the power sanders will concentrate the sanding and take it down to bare metal.
tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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