My powder coater sprays a candy black over chrome or polished ss, alum and it comes out a beautiful. Very popular on truck wheels. The powder he gets is polyester or epoxy base. I dont know how it would hold up to a firearm. Maybe there is a cerakote type candy black out there.
Concentrated power is not rendered harmless by the good intentions of those who create it.
"If you find yourself in a fair fight,,,
Your tactics suck"- Unknown