My research led me to choose Swain Tech coating.
ONly comes in white but can be painted with high temp paint. I painted mine black and it is hanging in there staying black on mild steel turbo headers.
Swain tech is actually a .015 thick ceramic coating vs the others which in my opinion are glorified powder coats, but its not like I've used all of them. I just had poor results getting mine coated locally not sure what product they used. The Swain tech seems to insulate really well although it is a "rough" surface which some may not like. It was also more expensive then the other options and took longer not to mention shipping to NY.
Note that mild steel headers will exfoliate small little silver balls through the coating its kind of a weird deal but doesn't cause any harm and not that noticeable cosmetically. But stainless doesn't do that.
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