Preparation for Painting Aluminum Siding

Scraping

• Scrape off any peeling or chipping paint as attaining a smooth surface is important in achieving a quality finish on aluminum siding. Use a wide plastic scraper, and apply light pressure to avoid scratching the aluminum.

Washing

• Aluminum siding must be thoroughly cleaned before repainting. Gather together a bucket of soapy water, heavy-duty sponges and a scrub brush. A white, chalky material on the siding is a sign of aluminum oxidation. Be sure to scrub it off or the paint will not adhere well to the surface. Rinse the siding with a garden hose after washing. Avoid power washing unless you are experienced. High pressure from a power washer can dent aluminum. Additionally, if the water finds its way behind the siding, it can lead to bigger problems down the road.

Drying

• Allow the aluminum siding to dry for a minimum of two to three days. Don't be tempted to start painting before the siding is completely dry. Cool, overcast days provide the best environment for painting aluminum, so check the weather forecast for favorable conditions.

Repair and Prime

• Repair small holes with caulk or auto body filler, and look for an oil-based corrosive-inhibiting primer. Like many common metals, aluminum is subject to corrosion from air and water. A high-quality exterior latex paint is fine for painting aluminum siding, but the extra cost for a specialty primer is worth it to ensure a long-lasting, durable paint job. Follow the manufacturer's recommendations for application and drying times.