I tried VHT on my headers a few years ago and it only lasted about a week before they turned to rust.

Last time I used Seymour hi-temp "cast-blast" and it holds up a lot better but still not perfect. They smoked the first few starts but after a few heat cycles it cured ok. I did them about a year ago now and they are just starting to rust again on the bottom of the car from road spray but it's easy to touch up.

My TTI headers are 4 years old and the ceramic coating still looks good. They dulled down some during my last camshaft break in.....Thats to be expected though. It states that in their tech sheet.

I blasted my new headers, then painted with VHT, then had them baked at the local powdercoaters. Of course I didn't touch them with bare hands, though you don't know what happened at the powder coaters. Didn't last well at all, I doubt if I have 5 hours on the motor and most of the paint is gone.