These paints are formulated to protect and duplicate the original look of many metal parts on your car. Detail Gray is used for stamped or machined steel, rough cast aluminum and pot metal. Also for die-cast parts like alternator and distributor housings. Aluma Blast provides protection and durable finish for smooth-cast aluminum components. Spray Gray protects cast iron parts and maintains their fresh cast factory appearance. Protected up to 300 degrees by these paints, metal parts will keep that brand new look for a long time.