Scrape away rust with a wire brush.
If you paint old aluminum siding, you'll have to address a pair of important issues. First, unlike wood surfaces, aluminum siding is ill-suited for paint adhesion and must be abraded with a special type of primer that will condition the surface to accept paint. In addition, if your aluminum siding is old, you may need to remove and seal rust with a specific type of coating, or the problem will recur.
Instructions
1. Clean the old aluminum siding, using a pressure washer. Allow the siding to dry out completely.
2. Scrape away rust, using a wire brush.
3. Apply an acrylic-based red oxide primer to the rusted areas with a paintbrush, effectively sealing them to prevent recurrence. Allow the primer to dry for two hours.
4. Wash the brush with water.
5. Abrade the aluminum siding to promote adhesion by applying a coat of galvanized metal etching primer, using the roller. Allow the etching primer to dry for two hours.
6. Wash all painting tools with water.
7. Apply a coat of exterior acrylic latex paint to the primed aluminum siding, using the roller stocked with a fresh, clean nap roller cover.
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