Things You'll Need
Sandpaper or wire brush
Rust-proof primer for metals
Paint for metals
Galvanized metal is steel coated with a thin layer of zinc oxide. Galvanized steel or metal is a common building material. The zinc oxide forms a barrier that protects the steel from corrosion. But when this thin layer wears away, the steel is subject to rust. Rust frequently forms on metals that are exposed to water or other forms of moisture. Removing rust is an important first step because if the rust is not removed it continues to spread creating rust-holes that are difficult and expensive to repair. Once all the rust is gone from the galvanized metal, then you can paint it.
Scrub off the surface rust with sandpaper or a wire brush. Serious rust is rare on galvanized metal because of the zinc oxide. Sand the surface to make it smooth.
Apply a rust-proof primer to the galvanized metal with a paint brush. Use a primer designed for use on metals. Allow the primer to dry completely. Apply a second coat. The primer provides a corrosion barrier just as the zinc oxide did.
Paint the galvanized steel with paint made for metals. Use a brush to paint in smooth even strokes. Allow paint to dry completely.