No one seems to be answering you, so thought I would take a shot. I recently applied a liquid bronze coating to a concrete sculpture and then patinaed it and then used a black wax that they sent with the bronzing stuff. It was from Sculpt Neuveau. I understand there are other products that are similar, but I wanted one that I knew would do well outside all year. You could get a wide range of metallic finishes as well as a ton of different patinas. I used some patina I had on hand.

Thanks so much.