If you are looking for a natural metal paint, choose Graphenstone Grafclean Midsheen and use the Four2Four Natural natural primer. Once you've primed with the four2four, you can paint this on almost any surface! "Four2Four Premium is an adherence bridge for paint. It ensures adherence of mineral paint to all types of surfaces such as tiles, phenolic panels, polyurethane paint, etc., for indoors and outdoors applications. In addition, it acts as an antioxidant in metal substrates (free of corrosion or oxidation) and as a sealant of wood, MDF boards and stains on interior walls."