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Been through this a few times over the last 30 years or so...had porcelain on one car, and when they baked the headers, they straightened out a little bit and the fit changed; later on the porcelain developed little cracks like lacquer-checking.
The Jet-Hot kind of stuff seems to last forever, but you need to have the header fit finalized beforehand.
I've used Eastwood's Stainless Steel exhaust paint on a couple of cars' headers - sprayed on, reduced a bit with enamel reducer - and it worked fine in a dry climate. Gotta bead-blast first, but whatever mods you need to make can be touched up by gun or foam brush.
I always cut & trim back the header flanges to eliminate warpage & increase plug access.



Is it the brush-on stuff you used or the product that is to be applied with a airbrush?

I am leaning towards giving the paint a shot. Get them blasted first, prep good, etc. I plan on throwing together a test stand to run the engine before it goes in the car, that will be a good chance to bake the coating good, and see how it holds up. If it turns to crap, I guess I could send them out for coating at that point.

383, Hemi 4-Speed, AlterKtion, D60