Can You Paint Aluminum Siding?
QUICK ANSWER
Yes, you can paint aluminum siding and it actually paints well compared to vinyl. Clean the surface, lightly scuff to remove any chalking, prime with a metal-bonding primer, then apply two coats of 100 percent acrylic latex exterior paint. Unlike vinyl, color choice has no heat restriction.
Aluminum siding is one of the easier sidings to repaint, mostly because aluminum does not expand and contract dramatically like vinyl does, so paint stays put without specialty formulations. Older homes from the 1960s through 1980s often have aluminum siding that is faded, chalky, or out of fashion. Repainting is far cheaper than replacing. Here is the right process to make the paint last.
Why does aluminum siding take paint better than vinyl?
Aluminum is dimensionally stable, meaning it does not flex significantly with temperature changes. That stability means standard exterior paint stays bonded to the surface for years rather than cracking from movement. Aluminum also has a slightly textured factory finish that paint grips well. Vinyl, by contrast, expands and contracts visibly with temperature and requires special flexible paint formulations. You can use almost any quality exterior paint on aluminum, and color choice has no heat-absorption restriction.
How do you prep aluminum siding for painting?
Cleaning is the most important step. Old aluminum siding usually has a chalky surface (oxidation), which is loose powdery residue from years of UV exposure. Wash with a pressure washer or garden hose and a stiff brush, using a mix of TSP (trisodium phosphate) or a TSP substitute with water to remove all chalking. Rinse thoroughly. Let dry 24 to 48 hours. Scuff any glossy areas lightly with a fine sanding sponge. Repair dents and holes with aluminum siding caulk before painting.
What primer and paint should you use?
Apply a metal-bonding primer first, especially on bare or heavily oxidized areas. Sherwin-Williams Pro-Block, Zinsser 1-2-3, or a similar acrylic bonding primer works well. Skip primer only if the existing finish is in good shape and not chalking. For the top coat, use a 100 percent acrylic latex exterior paint in any finish (satin and semi-gloss work best for aluminum siding). Two coats is standard. Avoid oil-based paints since they trap moisture against the metal and can cause issues over time.
How long does paint last on aluminum siding?
A quality paint job on properly prepped aluminum siding lasts 15 to 20 years. That is longer than vinyl repaints because the surface is more stable and accepts paint better. South-facing walls fade faster than other sides. Coastal salt air shortens the life. The big risk to longevity is skipping the chalk-removal step, which causes the paint to peel within a year or two no matter how good the paint is. Prep determines longevity more than paint quality.
Aluminum siding paints well and a quality job lasts 15 to 20 years. The keys are removing chalking thoroughly during prep, using a metal-bonding primer where needed, and applying two coats of quality acrylic latex paint. Unlike vinyl, you can go any color you want. Skipping prep is the most common reason paint jobs fail early, so do not rush the wash and dry steps.
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