I just looked it up and one finish which you simply spray on and bake in an oven is Brownells’ Gun-Kote.
It is said to be much more durable than blue.
I apply Gunkote, Duracote and am a certified applier of CeraKote. I find Gun Kote and Durakote to be much easier scratched than a properly applied bluing. CeraKote is more durable than the other 2 sprayon coatings.
I concur. It's actually made by KG Industries. It's incredibly tuff stuff. I refinished my CZ 82 with it and couldn't be happier. I used the matte black color.