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took them off the truck they were not painted before they were rusty
cleaned them off with break cleaner
hung them up
painted them with a can or two of VHT black
installed them 2 days later
1 day later started up the engine
it was 10-80% humidity the whole time
havent seen any flake or fade yet only 250 miles but I assume its on there good.
Not too long ago I installed headers on my 302, they come with a black cheap coating for shipping purposes only and need to be sanded off which I did. I then sprayed them with the VHT high temp black and now 700 miles later I have areas burnt off down to the metal. I'm about to send them off to be Jet-Hot coated and be done with it..