Painting Aluminum Siding: Cost, Process & What to Expect

Why Paint Aluminum Siding Instead of Replacing It?

If your Chicago home has aluminum siding that looks faded, chalky, or just outdated, you might assume a full siding replacement is the only option. It isn't. Painting aluminum siding costs a fraction of replacement — typically 20% to 30% of the price of new vinyl or fiber cement — and when done correctly with the right products and prep work, a professional paint job on aluminum siding lasts 5 to 10 years before it needs attention again.

Aluminum siding itself is one of the most durable cladding materials ever put on American homes. It doesn't rot like wood. It doesn't crack like vinyl in extreme cold. It doesn't attract insects. The material underneath is almost always in fine structural condition — it just looks tired. That makes it one of the best candidates for painting rather than replacing.

Thousands of homes across Chicago's North Shore, Lincoln Park, and suburban neighborhoods still have their original aluminum siding from the 1960s through 1980s. The siding is solid. The color has simply given up. A professional paint job restores curb appeal, protects the metal from further oxidation, and buys you another decade of performance — all without the disruption, waste, and five-figure expense of a tear-off and re-side.

Aluminum Siding Painting Costs in Chicago (2026)

Pricing for aluminum siding painting depends primarily on the square footage of exterior surface area, the condition of the existing coating, how many stories the home is, and the number of windows, doors, and trim details that require masking or cutting in. Here are the ranges we see most often in the Chicago market:

Why Aluminum Siding Is Different from Wood and Vinyl

Aluminum siding presents unique challenges that make it fundamentally different from painting wood clapboard or even vinyl siding. Understanding these differences is the key to understanding why proper technique matters so much — and why not every painter should take on an aluminum siding job.

Chalking: Over time, the factory-applied finish on aluminum siding breaks down and creates a powdery, chalk-like residue on the surface. Run your hand across old aluminum siding and your palm comes away white or colored. This chalk must be completely removed before painting, or the new paint adheres to the chalk dust instead of the metal — and it will peel within a year.

Oxidation: Aluminum oxidizes when the protective coating fails. Unlike rust on steel, aluminum oxidation creates a thin, dull layer that actually protects the metal underneath. But paint doesn't stick well to oxidized aluminum without proper priming. Standard exterior primer won't cut it — you need a bonding or adhesion primer specifically formulated for metal surfaces.

Thermal expansion: Aluminum expands and contracts significantly with temperature changes. In Chicago, where we routinely see 100-degree temperature swings between summer highs and winter lows, this movement is substantial. The paint film must be flexible enough to move with the metal. Rigid coatings crack. This is why 100% acrylic latex paint is the standard for aluminum siding — it remains flexible across a wide temperature range.

The Professional Process: Step by Step

A properly executed aluminum siding paint job follows a specific sequence. Skipping any step compromises the entire project. Here's what the process looks like when it's done right:

Step 1: Power Wash with Mildew Treatment

The entire exterior gets power washed at moderate pressure — typically 1,500 to 2,000 PSI for aluminum, which is lower than what you'd use on concrete or brick. The wash water includes a mildewcide solution to kill any mold or mildew growing on the siding, especially on north-facing walls and shaded areas. This step also removes the bulk of the surface chalk. The siding must dry completely — usually 24 to 48 hours — before any further work begins.

Step 2: Scrape and Sand Loose or Chalking Paint

After washing, the crew hand-scrapes any areas where the existing paint is peeling, bubbling, or flaking. A test wipe with a dark cloth identifies areas where chalk residue remains. Those areas get additional cleaning or light sanding with 150-grit sandpaper. On heavily chalked surfaces, a liquid deglosser may be used as a final cleaning pass. The goal is a clean, sound surface with no loose material and no chalk residue.

Step 3: Spot-Prime Bare Aluminum with Bonding Primer

Any area where bare aluminum is exposed — from scraping, dents, scratches, or oxidation — gets a coat of bonding primer specifically rated for metal substrates. This is not regular exterior primer. Products like Sherwin-Williams Extreme Bond Primer or STIX by Benjamin Moore create a chemical bond with the aluminum surface that standard primers cannot achieve. This step is non-negotiable. Skipping it guarantees adhesion failure on those spots.

Step 4: Caulk Seams and Gaps

All seams between siding panels, gaps around window and door trim, and any areas where the siding meets other materials (brick, wood, soffit) are caulked with a paintable, exterior-grade elastomeric caulk. This serves two purposes: it prevents moisture intrusion behind the siding, and it creates clean lines at transitions. On older Chicago homes, this step alone can significantly reduce drafts and energy loss.

Step 5: Apply Two Coats of 100% Acrylic Exterior Paint

The finish coats are where the transformation happens. Two full coats of premium 100% acrylic exterior paint are applied, with proper dry time between coats (typically 4 to 6 hours depending on temperature and humidity). Two coats provide proper film thickness for UV protection, weather resistance, and color depth. A single coat on aluminum siding will look thin and fade faster.

Best Products for Aluminum Siding

Product selection matters enormously on aluminum siding. The wrong paint will chalk prematurely, lose adhesion, or fail to flex with the metal through Chicago's temperature extremes. Here are the products professionals rely on:

• Sherwin-Williams Duration Exterior: Our go-to for aluminum siding. Exceptional adhesion, self-priming on previously painted surfaces in good condition, excellent color retention. The acrylic/alkyd hybrid formula provides outstanding flexibility and a smooth, even finish.
• Benjamin Moore Regal Select Exterior: Another top-tier option with excellent leveling and adhesion properties. Works particularly well on aluminum when paired with BM's Fresh Start bonding primer.
• Primer — SW Extreme Bond or BM STIX: For bare or heavily oxidized aluminum, these bonding primers are essential. They create a molecular-level bond with metal surfaces that standard primers simply cannot match.

Brush/Roll vs. Spray: Pros and Cons

Both application methods work on aluminum siding, but each has trade-offs that are worth understanding before you hire a contractor.

Spraying produces the smoothest, most factory-like finish and is significantly faster. An experienced spray crew can complete a medium home in 3 to 4 days versus 4 to 6 for brush/roll. However, spraying requires extensive masking of windows, doors, landscaping, and neighboring properties. Overspray on cars, plants, and neighboring homes is a real risk if the crew cuts corners on protection. Wind is also a factor — in Chicago, lakefront and elevated locations can make spray application challenging on some days.

Brush and roll application is slower but offers some advantages: better paint penetration into the surface profile of the siding, less masking required, no overspray risk, and the ability to work in windier conditions. The finish won't be as glass-smooth as spray, but with quality paint and skilled technique, the result is excellent and many homeowners actually prefer the subtle texture.

Many professional crews use a hybrid approach: spraying the large, uninterrupted field areas of siding and brush-rolling around trim, windows, and detail areas. This balances speed, finish quality, and precision.

Common Mistakes That Ruin Aluminum Siding Paint Jobs

The most common failures on aluminum siding are almost always caused by one of these mistakes:

• Using the wrong primer: Standard exterior primer does not bond properly to aluminum. A dedicated bonding/adhesion primer is mandatory on any bare or heavily oxidized areas. This single mistake accounts for the majority of peeling failures on aluminum siding.
• Painting in direct sun: When aluminum siding is in direct sunlight, the surface temperature can exceed 150 degrees on a Chicago summer day. Paint applied to a surface that hot dries too quickly, preventing proper film formation. The result is poor adhesion and premature failure. Professional crews plan their work to stay ahead of the sun — painting north and east walls in the morning, south and west walls in the afternoon shade.
• Skipping chalk removal: If the chalky residue from the old finish isn't thoroughly removed, you're essentially painting on dust. The new paint will look great for a few months, then peel off in sheets, taking the chalk layer with it.
• Insufficient coats: One coat on aluminum siding is never enough. The paint film is too thin to withstand UV exposure and thermal cycling. Two coats minimum is the standard for a reason.
• Painting in cold or damp conditions: Acrylic paint needs temperatures above 50 degrees (and rising) to cure properly. Painting in late fall or early spring when overnight temperatures drop below 40 degrees can result in improper film formation and early failure.

Chicago Weather: Why Prep Matters Even More Here

Chicago's climate is uniquely demanding on exterior coatings. The lake effect creates persistent humidity on the North Side, lakefront neighborhoods, and near-shore suburbs, which accelerates mildew growth on shaded siding panels. Winter freeze-thaw cycles — where temperatures cross the 32-degree mark dozens of times each season — stress paint films repeatedly as the aluminum underneath expands and contracts.

Summer UV exposure is intense, particularly on south- and west-facing walls. And Chicago wind drives rain horizontally into siding seams and gaps that might stay dry in calmer climates. All of these factors mean that proper prep, proper products, and proper application technique are not optional luxuries — they're the difference between a paint job that lasts 8 years and one that fails in 2.

When Should You Replace Instead of Paint?

Painting is the right call for the vast majority of aluminum siding homes. But there are situations where replacement makes more sense:

• Severe denting: If large sections of siding are badly dented from hail, impact damage, or settling, paint won't hide the damage. The dents will be even more visible with a fresh coat of paint catching light differently on the deformed surfaces.
• Widespread corrosion: True corrosion (not just surface oxidation) on aluminum siding is rare but does occur, especially in areas where dissimilar metals are in contact or where chronic moisture has been trapped behind the siding. If corrosion has compromised the structural integrity of the panels, painting is just cosmetic — the underlying problem needs to be addressed.
• Insulation goals: If your primary motivation is energy efficiency rather than aesthetics, insulated vinyl or fiber cement siding with integrated house wrap may be a better investment than painting existing aluminum over uninsulated sheathing.
• Major style change: If you want to change from horizontal lap to board-and-batten, shake, or a mixed material look, that requires new siding. Paint changes color, not profile.

For most homeowners, though, a professional paint job at $5,500 to $9,000 is dramatically more cost-effective than a $25,000 to $40,000 re-siding project — and delivers a comparable visual transformation.