Black metal mailbox – If you have run down street, noticed rust and paint failure on more than a few metal mailboxes. It is almost always due to improper preparation of the surface. Because metal rusting in the presence of oxygen and water, use a special type of primer to prevent rusting, or you will see telltale deep orange color is displayed over time.
How to paint a black metal mailbox, remove metal mailbox from his post and place it on top of a heavy-duty fabric drop cloth. Scrub the metal mailbox clean with a coarse brush. Rinse the mailbox thoroughly and let it dry. Third Cover parts of metal mailbox you do not want painted with painter’s tape.
After that to paint a black metal mailbox, apply a coat of spray zinc primer on metal mailbox to prevent it from rusting and encourage paint adhesion. Spray in short, intermittent spurts. Do not saturate the mailbox with primer. Let the primer dry for two hours and then apply a coat of spray enamel paint in the same way you apply primer. Allow the paint to dry for two hours and then apply a second coat if you can see primer showing through.