Who has done patina? I have some questions about penetrol...

I’ve heard of people using tung oil as a clear coat over steel. It cures really hard but has a long drying time. I think penetrol would work similarly, but like others have said, it’s designed to work with oil so I don’t know if it would go well with an epoxy paint. Now if this is a rustoleum paint job then i say slap it on...

Either way can’t hurt to test it right?