Oh, yeah didn't see the ceramic part lol. At my old job we'd turn the oven up as high as it'd go for ceramic and cure it about an hour. The oven would go to 450 and that would do it. No failures yet on headers that have been in service for a few years now, including my own! I hear you on the resiliant part though, the luster of my polished ceramic headers has dulled pretty badly now, but I can polish them back pretty easily! this is what they looked like when they were fresh though:
Ceramic is the closest thing to polished aluminum I have found, but it is VERY insulating so we don't wanna coat any temp sensitive parts with that stuff!!