Prep Work Before Painting: Pressure Washing, Scraping, and Priming

The Steps That Determine How Long Your Paint Lasts

Most exterior paint failures are not caused by bad paint. They are caused by bad prep. The work that happens before the first brushstroke determines whether your new finish lasts 3 years or 10. In the Pacific Northwest, where moisture is relentless, cutting corners on prep work is a guarantee of early failure.

Step 1: Pressure Washing

Every exterior paint job starts with a thorough wash. Pressure washing before painting removes dirt, mildew, algae, and chalking that prevent paint from bonding. In the PNW, even surfaces that look clean carry a film of organic growth that needs to come off. The house should dry for at least 24 to 48 hours after washing before any other prep begins.

Step 2: Scraping

All loose, peeling, and flaking paint must be removed down to a firm edge. Scraping is the most labor-intensive part of prep work, but it is non-negotiable. Painting over loose paint just creates a thicker layer that peels off faster. Problem areas typically include:

• Window and door trim
• Fascia boards and soffits
• South and west-facing walls with heavy UV exposure
• Areas near gutters and downspouts where water contacts siding

Step 3: Sanding

After scraping, edges where old paint meets bare wood need to be sanded smooth. This creates a gradual transition so the new coat does not show obvious ridges where the old paint ended. Sanding also roughens glossy surfaces to give primer something to grip.

Step 4: Repairs

Prep work reveals damage that was hidden under old paint. Common findings include dry rot in trim and siding, failed caulk around windows and doors, popped nail heads, and cracked boards. All of these need to be fixed before painting. Wood filler handles small holes and divots. Larger rot requires replacing sections of trim or siding entirely.

Step 5: Caulking

Every joint, gap, and seam gets fresh exterior-grade caulk. This includes window and door frames, corner boards, trim joints, and any penetration through the siding. Caulk prevents water from getting behind the paint and siding, which is the number one cause of paint failure in Vancouver WA.

Step 6: Priming

Bare wood, repaired areas, and stain-prone surfaces get primer. Primer seals the surface, blocks tannin bleed from cedar and redwood, and creates a uniform base for the topcoat. Skipping primer on bare wood leads to uneven absorption and blotchy coverage.

Good prep takes time, but it is what makes a paint job last. Contact us about exterior painting prep and get your home ready for a finish that holds up to PNW weather.