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Re: Rat repair.
Over the years I've come around to the "primer first, bondo second" mindset. Truth is, though, I've never had any issues going direct to metal as long as it's roughed up good using a DA sander with 80 grit or coarser paper. I think a layer of primer (self etch or epoxy) adds some extra insurance under plastic filler. But the best medicine is a sturdy topcoat... either a quality single stage urethane or BC/CC.
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