Well I guess I have to put a few words in here as well since I just got done doing this to the header pipe on my fathers savage.
I went down to Autozone and picked up a can of VHT (a PJI product) very high temprature - flameproof - 1300° to 2000° (704° - 1093°C) Header Paint. It also says Silica - Ceramic coating.
His header was rusty and had turned many different colors besides the normal purple or gold. We wire brushed the header pipe down and then lightly sanded it with (I believe) 220 grit sand paper to just clean the surface. It painted really easy and I had no runs with it.
They give two curing methods - the first is to bake it in an oven, so we didn't go with that one.
The second method is with the pipe back on the bike. Run at idle for 10 minutes and then let cool for 20 minutes. Run at idle for 20 minutes and then let cool for another 20 minutes. Then take it out for a 30 minute ride and it is done. (they say the finish is not chemical resistant until cured, so this is important).
So far I am very satisfied with it and from reading online about this paint it was originally made for NASA for use on the space shuttles. If that's the case I would think my header pipe is bit cooler then the space shuttle
Of course your mileage might vary 8)