Which VHT did you try? I've had good results with the stuff they call "Flame Proof", but the curing process isn't trivial. If you just spray it on and go riding it's not likely to cure properly. I've had it on my 250's head pipes for several years now with only minor touch-ups needed where it's gotten scraped on something.
Good old stove/header paint always works OK, but it does tend to chalk off a bit.
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