How to Paint Corroded Cast Aluminum
- 1). Put on a dust mask and eye protection to prevent inhaling metal dust and to prevent the dust from getting into your eyes. Spray the metal with a spray paint remover designed to remove paint from metal. Allow the remover to sit on the aluminum for about 10 minutes. Wipe away any remover residue with a soft cloth.
- 2). Sand the entire surface of the cast aluminum with the rust-removing sanding pad to remove all signs of corrosion and rust. Allow the aluminum to sit overnight. The paint remover will remove any paint and rust from hard-to-reach areas overnight.
- 3). Sand the metal with one final set of sanding using a fine-grit sanding attachment. Wipe down the surface of the aluminum with a damp cloth to remove paint and metal dust.
- 4). Spray the metal with an aluminum primer. Allow the paint dry for two hours, then apply a second coat of aluminum primer. Allow this coat to dry for two hours as well.
- 5). Spray the aluminum with the rust-resistant paint. Paint a total of about three coats of paint onto the metal, allowing each coat to dry for at least an hour between coats.