maybe this ?
An extreme high temperature paint available in quart containers as well as aerosol spray cans. This paint can be used in all high temperature applications and can withstand temperatures up to 1235°F (-653°C). This coating stops rust and provides a porcelain hard finish. Fast dry & chemical...
www.superior-industries.com
when I was doing up my old Volvo , I went to the "old ford center" they sold me some "stainless steel paint."
the stuff isn't' shiny at all it is a dull grey but seemed to match a lot of the original paints.
the way it works, first it has to be clean so acid etch or sandblast. I sandblasted mine. usually they just run the engine get it hot and that cures it. it smokes a lot and stinks. my manifold is a casting not steel pipe.
the can had a lot of warnings about health and safety. I wanted to harden it before installation I wrapped it with tin foil and stuck it in my barbecue. the paint bubbled so I acid etched it.
on my second attempt I used the oven when no one was home and I dont know if I'd recommend that . it would be good to use an oven that wasnt; used for food. maybe one that's used and on it's way tot he dump.
I did my ashtray , rocker cover etc. after 20 years it flaked off a bit on the manifold but stuck good everywhere else. the manifold sees severe temp changes.. the tin parts came out nice.
If you have used cold galvanizing paint it loks similar. I liked it because it looks stock. I still have a part can of it , it is thick and you paint-it on with a brush. It may be hard to find and may be outlawed now by EPA - or something.
the stuff I had was called "stainless steel paint" and I dont remember any mention of porcelain. I can get a pic of the old can if you want.
it's thick and made to go on thick with a brush and I think only one coat.
I wonder how copper or brass or nickle plating would look? it would have a neat appearance perhaps? chrome works but it's so common. you could probably do copper at home.