I would stay away from the 1500 degree rated paint. It is pointless to put that kind of paint on headers that won't get above 500 degrees, and that is if it is burning lean. Secondly, most of that type of paint requires a cure temperature of around 800 degrees, and for that curing process to be done relatively soon, within an hour or so, of your last coat. I am no farrier, but I have done a bit research and work with hardening and tempering carbon steels which require a keen eye on the colouring of the steel to determine different temperatures. Just for reference, using O1 steel as an example, a light straw or gold color, which is normal for the bandit would be around 445-465 degrees. You start getting into the purple blue range at about 520 to 575 degrees. Just so you know, 1500 degrees is cherry red. Now granted, with the high chromium content of the stainless and other combination of alloys, those temps and colors vary, but not by a lot. I also have an decent infrared thermometer that I use for work but have checked my header temps on many different occasions, and although it is hard to get a good reading because of the high reflective properties of the metal, I have never seen it above 500 degrees.
Sorry to ramble.