i used the silver matte finish. it has lasted longer that a set of tti's i use to have. prep is the key for a good finish. i beleive u need a 240 grit finish. no glass beading. i modified a old electric oven, 1 header fits in nicely. cured 1 hr @ 800 deg. finish never came off. for what it cost for jet hot, u can do ur own headers many times & it still would be cheaper.