Use Patina over the CF METAL COATINGS or direct to metal. The TIFFANY GREEN/RUST PATINA and the GREEN-GOLD/VERDIGRIS PATINA both add a green bloom to brass, copper and bronze metals and a rust oxidation to iron. These are real patinas and they actually oxidize metal (both real metal and metal coated pieces!) You can add more than one type of patina at the same time. Or you can add one patina, then let that dry and add a different one. Or you can add patina layer after layer. Whatever! There are no rules right!