Car body paint can't be used on a street vehicle. It is not designed to take any heat. If you notice that vehicles left out in sun, the body surfaces reach about 125 degrees F, well there paint is fried and peeling off. Well that is what will happen when you put it on some metal that gets to 250+ degrees. If it can't stand 125 degrees for too long, then it won't stand up against 250 either. The UV rays do add a little bit of a death blow but heat is heat. Use the enamel that is formulated for high heat usage. Why do you think Dupli-Color pays their chemists to develop this stuff. Most engine enamels come in a rating of 550+ degrees and last for a fair amount of time. You can't really spray the motor in the car so the brush on seems to be the bes way to go. With it, you can always touch up areas without worrying about overspray. Please, brushon application seems to be considerably thicker and holds up longer.
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