POR hates grease, but likes a lightly rusted surface as it can grip even more if that makes any sense.
there is an additive you can get to help paint stick over it, and I think another to help it not fade from UV.
I did the Chassis of my 68 Firebird about 15 years ago, and its still looking pretty good, can't say the same about the body parts I did with paint.
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I'm not sure what kind of class those little cars are, but it looks like a load of fun.
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