Zinc rich painting, generally referred to as the misnomer cold galvanizing, is the application of zinc dust combined with organic or inorganic binders by brush or spray. In dry film, zinc-rich paints contain 65-95 per cent metallic zinc, with 92-95 per cent usual. The paints can be rubbed into the steel or sprayed on.
Zinc rich primers are used against corrosion to protect steel surfaces. Zinc-rich primers, an impermeable buffer between the metal and ambient moisture, offer electrical protection against corrosion.
Zinc rich paints contain a high level (85%-92%) of zinc metal pigments which function as an active anti-corrosion component. This kind of paint creates a metallic zinc film that acts as a physical barrier, as well as providing cathodic protection for the underlying steel.
If you want zinc-plated metal to be painted, pre-treat it with a primer, specifically formulated with acidic qualities that allows the etching of zinc-plated metal surfaces that last. Use the proper brush to apply the base and finish coats or the finish can dry marred with brush marks.