Can you paint aluminum siding? Absolutely — and it's one of the most cost-effective ways to transform an older Minnesota home's exterior. Aluminum siding was widely installed from the 1940s through the 1980s, and while durable, it often develops a chalky, faded appearance over the decades. At Weatherguard Construction, our family-owned team has refreshed countless aluminum-sided homes across Stillwater, St. Paul, Minneapolis, and the Twin Cities metro during our 25+ years in business. Here's our complete guide to painting aluminum siding in Minnesota.
Why Paint Aluminum Siding?
Aluminum siding is structurally sound and can last 40-50+ years, but its factory-applied finish typically fades and chalks within 15-25 years. Rather than replacing perfectly functional siding at $10,000-$30,000+, painting offers a dramatic cosmetic refresh at a fraction of the cost. Painting aluminum siding allows you to:
- Update your color to modern palettes and trends
- Restore curb appeal without the expense of full siding replacement
- Add an additional layer of protection against corrosion
- Increase home value with a fresh, well-maintained appearance
- Extend the functional life of your existing siding by decades
Preparing Aluminum Siding for Painting
Proper preparation is absolutely critical for aluminum siding — perhaps more so than for any other exterior surface. Aluminum's smooth, non-porous surface means paint must rely entirely on mechanical and chemical adhesion rather than absorption. Cut corners on prep, and your new paint will peel within a year.
Step 1: Clean Thoroughly
Aluminum siding accumulates decades of oxidation (chalking), dirt, mildew, and environmental grime. All of this must be removed completely before painting.
Power washing at 1,500-2,500 PSI with a cleaning solution designed for aluminum siding is the first step. Use a wide-angle nozzle (25-40 degrees) to avoid denting the aluminum. Pay special attention to areas under eaves and overhangs where mildew tends to accumulate.
Chalking test: After washing and drying, rub a dark cloth across the siding surface. If significant white residue transfers, additional cleaning is needed. All chalking must be removed for proper paint adhesion.
Step 2: Repair Damage
Inspect the siding for dents, scratches, loose panels, and damaged sections. Minor dents can be filled with exterior-grade auto body filler and sanded smooth. Loose panels should be re-secured. Severely damaged sections may need replacement with matching aluminum panels.
Check all caulking around windows, doors, and trim joints. Remove deteriorated caulk and re-caulk with quality paintable caulk rated for metal surfaces.
Step 3: Sand Lightly
Lightly scuff-sand the aluminum surface with 150-220 grit sandpaper or a sanding pad. This creates microscopic scratches that dramatically improve paint adhesion. Focus on glossy areas and any remaining chalking. This step is tedious but absolutely essential for long-term paint adhesion.
Step 4: Prime
Apply a high-quality bonding primer specifically designed for metal surfaces. Products like Sherwin-Williams Extreme Bond Primer or Benjamin Moore Stix are formulated to grip smooth, non-porous surfaces like aluminum. Standard exterior primers will not provide adequate adhesion on aluminum.
Apply primer in thin, even coats using spray equipment for the most uniform coverage. Allow full drying time as specified by the primer manufacturer before topcoating.
Choosing the Right Paint for Aluminum Siding
Paint Type
Use 100% acrylic latex exterior paint for aluminum siding. Acrylic latex provides excellent flexibility, adhesion, and durability on metal surfaces. It expands and contracts with temperature changes without cracking — critical for aluminum, which conducts heat and experiences significant thermal movement.
Avoid oil-based paints on aluminum siding — they become brittle over time and are prone to cracking in Minnesota's temperature extremes.
Recommended Products
- Benjamin Moore Aura Exterior (premium choice)
- Sherwin-Williams Duration Exterior
- Benjamin Moore Regal Select Exterior
- Sherwin-Williams SuperPaint Exterior
Sheen Selection
Satin or low-lustre finish is ideal for aluminum siding. It provides good durability and cleanability while being forgiving of the minor surface imperfections common on older aluminum panels. Semi-gloss works well for trim and accent areas.
Application Techniques
Spray Application
Airless spraying is the most efficient and effective method for painting aluminum siding. It provides the most uniform coverage on aluminum's smooth surface and reaches into the panel overlaps and detail areas more effectively than brushing or rolling. Our crews apply paint at the manufacturer's recommended mil thickness for optimal coverage and protection.
Two Coats Are Essential
Always apply two full coats of paint over the primer. The first coat seals and provides a base, while the second coat delivers the final color depth and maximum protection. Single-coat coverage on aluminum often results in uneven color and reduced durability.
Weather Conditions
Paint aluminum siding when temperatures are between 50 and 85 degrees Fahrenheit with low humidity. Aluminum surfaces heat up significantly in direct sunlight, so our painters follow the shade around the home and avoid painting sun-heated surfaces. This prevents the paint from drying too quickly and ensures proper film formation.
How Long Does Painted Aluminum Siding Last?
With proper preparation, quality primer, and two coats of premium acrylic paint, professionally painted aluminum siding typically lasts 8-12 years in Minnesota before needing repainting. This is a significant improvement over the faded, chalky appearance that prompted the repaint.
Factors that influence longevity include sun exposure, color choice (lighter colors last longer), paint quality, and the thoroughness of the original preparation. North-facing walls typically last longer than south-facing walls due to reduced UV exposure.
Painting vs. Replacing Aluminum Siding
Painting aluminum siding costs roughly one-third to one-half what new siding replacement costs. If your aluminum siding is structurally sound — no severe denting, corrosion, or missing sections — painting is an excellent value. However, if your aluminum siding is severely damaged or you want improved insulation and a modern profile, replacement with LP SmartSide or fiber cement may be a better investment.
Contact Weatherguard Construction at (651) 439-4320 or book a consultation for honest advice on whether painting or replacing your aluminum siding makes more sense for your situation. We serve homeowners from Stillwater, plus Schaumburg, IL and Centennial, CO.
Frequently Asked Questions
How much does it cost to paint aluminum siding?
Professional aluminum siding painting in Minnesota typically costs $2.50-$5.00 per square foot including washing, preparation, priming, and two coats of paint. A typical home costs $6,000-$12,000 — significantly less than siding replacement.
Can you paint aluminum siding a dark color?
Yes, but with caution. Dark colors absorb more heat, causing aluminum to expand more dramatically and potentially leading to oil-canning (waviness). If choosing a dark color, use premium paint with excellent UV resistance and flexibility. Consult with Weatherguard Construction about color selection for aluminum.
Do I need to prime aluminum siding before painting?
Absolutely. Priming with a high-quality bonding primer designed for metal surfaces is essential for aluminum siding. Skipping primer is the most common cause of paint failure on aluminum — the topcoat simply won't adhere properly without it.
Can I paint aluminum siding myself?
While it's possible, professional painting of aluminum siding is strongly recommended. The extensive preparation required — thorough cleaning, chalk removal, sanding, and proper priming — is time-intensive and critical for success. Professional spray equipment also delivers a significantly smoother, more uniform finish than DIY brush or roller application.
