- 1). Identify the metal, specifically whether the metal is aluminum, as aluminum requires a primer coat of zinc chromate to avoid a damaging chemical reaction between the metal and the paint. Aluminum is softer than steel and dents easily with relatively little pressure. Press a hard, blunt object such as a coin or tool handle against the metal. If it dents easily, chances are it's aluminum. It also has a more difficult time than other metals retaining paint. Rub a cloth over painted metal for a few seconds. If chalky residue rubs off on the cloth, chances are again good that the metal is aluminum. A sure way to know is to examine any purchase paperwork or to ask the retailer from whom the metal was purchased.
- 2). Clean off any spots of rust with a wire brush and wash the metal with water mixed with a small amount of bleach to remove dirt, solvents and mold, all of which prevent proper paint adhesion. Rinse with clear water and dry the metal completely before continuing.
- 3). Sand the metal lightly with fine grit sandpaper to provide a roughed-up surface for paint adhesion. Wipe the metal down with a clean cloth to remove sanding residue.
- 4). Spray the metal with a metal primer. Use zinc chromate if the metal is aluminum. Allow the primer to dry completely before continuing.
- 5). Spray on one to two coats of paint specifically formulated for covering metal. Allow the paint to dry completely before exposing the metal to wind or rain.
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