Do You Need to Seal a Driveway After Pressure Washing?
Sealing a San Diego driveway after pressure washing is optional, not required. We seal about one in three concrete driveways we clean, usually stamped or decorative slabs and coastal surfaces near salt air. Bare gray concrete rarely needs it. If you do seal, wait until the slab is fully dry, roughly 24 to 48 hours.
Last updated: July 2026
Customers ask us this on almost every driveway job. The short answer depends on what the driveway is made of and where it sits.
Bare broom-finish concrete, the standard gray slab most San Diego homes have, does fine without sealer. We clean thousands of square feet of it a year and the surface holds up. But stamped concrete, exposed aggregate, and pavers are a different story.
When Sealing Actually Helps
We recommend sealing in three situations. Decorative or stamped concrete, because the color coat wears and a sealer protects it. Coastal driveways in Point Loma, Ocean Beach, and Pacific Beach, where salt air and marine-layer moisture push efflorescence and algae faster. And any slab that has just had oil stains pulled, since a sealed surface makes the next spill easier to lift.
Inland North Park and Kensington driveways that mostly grow spring algae usually do not need it. A clean slab and good drainage handle those.
Sealed vs Left Bare
| Factor | Sealed | Left Bare |
|---|---|---|
| Added cost | $0.15 to $0.40 per sq ft | $0 |
| Stain resistance | Higher, oil beads up | Lower, oil soaks in |
| Reseal interval | Every 2 to 3 years | Never |
| Best for | Stamped, colored, coastal | Bare gray concrete |
| Look | Slight sheen, darker | Natural matte |
How Long After Washing Can You Seal?
Concrete has to be dry all the way through, not just on the surface. In San Diego summer that is about 24 hours. In a coastal winter with a heavy marine layer, give it 48. Seal a damp slab and you trap moisture, which clouds the sealer white and can flake it off within months.
We stopped sealing same-day years ago after seeing exactly that happen on a Scripps Ranch job. The slab looked dry on top and was still holding water in the pores.
One more thing. Sealer needs a clean surface to bond, so the pressure washing has to come first. We run about 3000 PSI with a surface cleaner on flat concrete, then let it cure before any sealer goes down. If you want the two done together, we schedule the wash and come back after the dry window.
For pricing, our driveway power washing cost guide breaks it down by size, and if your slab has stubborn stains, see how we handle oil stains on concrete. Ready to book, start on our pressure washing page.