Are you sayingIcould use most anypaint as an undercoatif I lightly buffed it with 400 grit and then applied a coat (or two or three) of the Minwax urethane? I'm not doubting you, just gettting clarification for future project use. The urethane should/would act like a clear coat protection?
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.
I have small drops of 15% nitro on spinners that I have painted with Rustoleum and the paint bubbled in seconds. Top Flite Lustrekote is nitro proof to about 20%, but it stinks to high heaven so for your lungs' sake only use it outside. I typically use clear satin finish Minwax spray polyuretane to nitro proof any paint job that I do. Holds up quite well.