A professional, food grade ceramic/graphene coating formulated to seal and protect all types of metals: steel, stainless, copper, aluminum, brass, bronze and galvanized etc. Prevents corrosion, oxidation and rust on outdoor stainless grills, ovens, appliances as well as all metal parts on AC/HVAC compressors, air handlers and air ducts and any metal hardware exposed to the elements. Read and follow all application instructions in TDS. No food grade ceramic to compare to.