higher temperature coating have SERIOUSLY come a long way in the past few years. I used to ceramic-coat (liquid based) headers all day long and know full well it was going to wear off in a short while. But that's all we had (and we liked it that way when I was a young'un! lol). We would sit there with 0000 steel wool and burnish them until they looked like chrome and think to ourselves "this is the best it will ever look in it's entire life". Not so with todays formulations. I'm sure you will get some minor amount of discoloration with any coating at the apex of the exhaust header where the gases exit. This is to be expected. I'd assume with the black however.... when it cools it will turn back to that original black you expect it to. Or at the very least.... not so discolored you'd even notice it. Think of it this way...... your gas grille doesn't turn all sorts of blue and green does it? Same stuff basically. Your run of the mill matte-black that lasts for quite a while. I have no doubt you'll be happy with that powder..... Russ
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