ORIGINAL: irocbsa
I think it is a common misconception that Rustoleum is nitro proof. In it's modern form it definitely is not, at least not to 15% nitro fuel which is what a lot of us use. From what I understand, in it's heyday Rustoleum was quite fuel proof but then Big Brother madated the elimination of most of the VOCs that were in spray paint so now it is just as un-nitro-proof as the rest of the off the shelf brands.
Not unless they've changed it in the last couple years. I use gloss Rustoleum on my plastic SPADs and it holds up well with no top coat. I think maybe the problem is there are several *types* of Rustoleum now and folks aren't getting the right thing. But maybe it's changed recently and the paint I have is still the old forumla.

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