Exterior Painting Prep: The Complete Homeowner Checklist

The most common reason exterior paint peels within a few years isn't cheap paint - it's poor preparation. Here is exactly what proper exterior prep looks like, and what to expect when hiring a professional painter in the Lehigh Valley.

The 8-Step Exterior Prep Process

Step 1: Inspection

Before any work starts, a thorough walk-around to identify all issues: peeling paint, damaged wood, caulk failures, rot, mold, and missing or cracked siding. All of these must be addressed before paint goes on.

Step 2: Power Washing

The entire exterior is power washed at 2,500-3,000 PSI to remove dirt, mildew, loose paint, and chalk. Painted surfaces must be completely clean for new paint to bond. We typically allow 24-48 hours of drying time after washing before painting begins.

Step 3: Scraping

Any remaining loose or peeling paint is hand-scraped after washing. This step is skipped by contractors who rush jobs - and it's the number one predictor of whether new paint will last. If it's not scraped, new paint applied over loose old paint will peel off in sheets within 1-2 years.

Step 4: Sanding

Scraped edges are feathered with sandpaper to create smooth transitions. On new wood or bare spots, sanding opens the grain for better primer adhesion.

Step 5: Wood Repair

Rotted wood is removed and replaced. Small damage is filled with exterior-grade epoxy wood filler. Soft or punky wood that looks solid but sponges when pressed must be replaced - paint cannot fix structural issues.

Step 6: Caulking

All gaps around windows, doors, trim, corners, and any joint where two surfaces meet must be caulked with a quality paintable caulk. Old failed caulk is removed first. This step prevents water infiltration that causes future paint failure and wood rot.

Step 7: Priming

Bare wood, repaired areas, and previously unpainted surfaces are primed before topcoating. Primer creates a consistent, adhesive base and prevents tannins in wood from bleeding through the finish coat. Skipping primer on bare wood almost always results in discoloration.

Step 8: Painting

Finally, 2 coats of exterior topcoat are applied. In the Lehigh Valley climate, we typically use 100% acrylic latex paints that handle the freeze-thaw cycles and humidity swings of PA winters and summers.

How Long Does Exterior Prep Take?

A properly prepped exterior paint job in the Lehigh Valley should last 8-12 years. Shortcuts cut that in half. When getting quotes, ask specifically what prep steps are included - the lowest quote often means the least prep.