[asallwey]

Caswell offers a chemical, under their Black Oxide process, that works on stainless steel.

Has anyone tried it?
Do you use the BO sealer to finish it?
Is it a surface treatment or does it penetrate?
Does it hold up about as well as BO (which is fine)?

I'm thinking of using it on SS bolts and nuts for my old car.

Thanks!

Alex