Header Paint?

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All I can say is any paint is not going to give the results and longevity that a good coating will. I have never had paint last for more then a week or two. The Edelbrocks on my truck were coated three years ago and they still look brand new. Not to mention the other benefits of engine compartment heat reduction and less noise.
If you are planning to spend the money to have the headers properly prepped for painting just save the headaches and have them coated.
Best money spent in my book.
Mark