At a glance there appears to be two choices, Jet-Hot and Cerakote.
Nice thing about Carakote is there's a shop 60 miles from me and it's near half the cost. Counting shipping it's far cheaper than Jet-Hot. Downside is he only has two colors, black and titanium, but I think they'd work for my exhaust manifolds (titanium), heat stove and stove pipe (black). A picture of the two colors below.
Jet-Hot offers a lot more colors. The Cast Iron is nice.
https://www.jet-hot.com/colors/
Seems like a no-brainer, run with the local. Anyone use either one or?