Commonly sprayed on in a paint booth, zinc chromate primer is used to protect zinc plated metal or aluminum alloys containing zinc. It works by interacting with the surface of the metal when it gets wet.
Red oxide metal primer acts as a preparatory or protective coating that prevents rust formation on the ferrous metal surfaces exposed to humidity and air. Used for gates, railings, and outdoor equipment the primer is applied to the rusty surfaces before applying a topcoat