Repainting Aluminum Siding in Southwest Ohio: Prep and Products That Last

TLDR:

• Wash, de-oxidize, and dull the surface before coating to avoid adhesion issues
• Use a bonding or metal-appropriate primer on bare or chalky areas
• Finish with two thin coats of high-quality exterior paint for even color and durability

Intro

Richardson Custom Painting has refreshed countless aluminum‑sided homes across Warren, Butler, and Hamilton counties. The usual problems we see are heavy chalking, faded color on sun‑exposed walls, and adhesion issues where previous paint was applied over gloss. Here’s the exact prep and product sequence our crews use in Southwest Ohio so your siding looks even and holds up through humidity and freeze‑thaw.

What It Is

A repaint system for aluminum siding focusing on cleaning, surface dulling, targeted priming, and weather-smart application.

Why It Matters

• Chalk and oxidation block adhesion
• Bare edges at seams and trim can corrode without primer
• Thin, even coats level better and resist peeling in Ohio weather swings

How It Works

1. Wash: Low-pressure wash with a siding-safe cleaner to remove dirt and chalk.
2. Dull: Lightly scuff glossy panels or use a de-glosser where needed.
3. Rinse and Dry: Rinse thoroughly. Let siding dry fully.
4. Prime: Spot-prime bare metal and stubborn chalk areas with appropriate primer.
5. Mask: Protect windows, fixtures, and landscaping.
6. Finish: Apply two thin finish coats, maintaining a wet edge to prevent lap marks.
7. Weather Window: Paint between 50–85°F and avoid late-day dew.

What To Do (Checklist)

1. Glove test: Rub a hand on siding; if chalk transfers, plan for extra cleaning and priming.
2. Address dents and loose trim before painting.
3. Confirm product compatibility between primer and topcoat.
4. Schedule for a low-humidity stretch.
5. Inspect sun sides after first coat for coverage and lap marks.

Common Mistakes

• Power-washing and painting before dry-down → Trapped moisture
• Skipping dulling on glossy areas → Adhesion failure
• Heavy single coat → Lap marks and poor cure

Care and Maintenance

• Annual gentle wash to remove dirt and mildew
• Touch up scratches before winter
• Keep gutters clear to prevent streaking

If you’re weighing a siding refresh, see our exterior painting services or request a quick, no‑pressure quote to compare options for your home.