De-trickulatatin a header coating conundrum.

Ricenuker, I cleaned for a living and alcohol, sprayed at that low pressure, will not adequately dislodge tightly adhered sand contamination. We would have used high pressure water and soap followed by a really good rinse and then an alcohol to help flash the water off. I know you are trying to avoid rust but not sure how you can get enough sand residue off to get great adhesion. I suspect it works a lot of time but in my business, it would not have.

I wonder too; would the urethane not burn off too and tend to flake since most of those are going to cook in the 500 degree F range and headers can see 700 to 1200 pretty easily at the port? I know the paint should have the binders that adhere but if the surface is not really clean, can they bind well enough?

Good luck with round 2. :):)
Tom