How do you polish copper and brass to a mirror finish? #metalpolishing #metalfinishing #copper #brass #metalpolish check out the robust cutting and polishing power of our Q36 one step cut and color metal polishing compound on this brass and copper antique fire extinguisher. We started off with our satin airway and prep discs and for go the intermediary fine grid sanding discs and then went directly to Q36 to bring out a clean and bright finish. Almost Chrome is running the grinder at 3500 RPM to