Cleaning a patio or deck is only half the job. Without a sealer, the freshly cleaned surface starts absorbing water and UV the day you finish, and in Ohio's climate that means the grime, algae, and freeze-thaw damage come back faster than they should.
Why cleaning alone isn't enough
A clean patio or deck looks finished, but bare concrete and wood are porous. Once the surface is stripped of contamination, those pores are open — and open pores absorb water, hold moisture, and give algae and mold a place to take hold again.
In Ohio, that matters more than in drier climates. Rain, snowmelt, and humidity keep outdoor surfaces damp for long stretches, and freeze-thaw cycling forces that moisture into the pores and back out again. Unsealed concrete and wood age visibly faster under those conditions.
What a sealer actually does
A sealer is a thin, protective layer that fills the pores near the surface and creates a water-resistant barrier. It does three things:
- Keeps water out, so freeze-thaw cycles can't work inside the surface.
- Blocks stains, so oil, leaf tannin, and salt sit on top instead of soaking in.
- Slows organic growth, because algae and mold struggle on a surface that won't hold moisture.
On wood, a sealer also slows UV damage — the sun that grays a deck within a season. On concrete, it reduces efflorescence and salt scaling, the two problems that age a patio fastest in Ohio.
How soon after cleaning to seal
The surface has to be dry before sealing. That sounds obvious, but it's the most common mistake. Sealer applied over damp concrete or wood traps moisture underneath, which can cause clouding, peeling, or — on wood — rot from the inside out.
A good rule:
- Concrete: wait 24–48 hours after cleaning, depending on humidity and sun. Test by taping a clear plastic square to the surface; if condensation forms under it overnight, it's still too damp.
- Wood: wait 2–3 dry days. Freshly cleaned wood also needs to dry out enough that a sealer absorbs evenly rather than sitting on top.
If the wood is new or was just stripped, it may need a longer drying period before sealing. Rushing this step is the main reason sealers fail early.
Choosing the right sealer for the surface
Not all sealers are the same. The right one depends on the material and the look you want.
- Concrete patios and walkways: a penetrating silane-siloxane sealer repels water without changing the look. A film-forming acrylic sealer adds a slight sheen and better stain protection but needs more upkeep.
- Wood decks: a semi-transparent penetrating oil sealer protects and shows the grain. Solid stains hide the grain but offer more UV protection for older wood.
- Paver surfaces: a joint-stabilizing sealer locks the sand in the joints and protects the paver face.
For Ohio's climate, a penetrating sealer is usually the more durable choice for concrete because it doesn't wear off with freeze-thaw the way a film-forming sealer can.
How long a good seal lasts in Ohio
A quality sealer applied to a properly prepared surface typically lasts:
- Concrete patios and walkways: 2–3 years.
- Wood decks: 1–2 years, with sun-exposed decks on the shorter end.
- Paver surfaces: 2–3 years.
The surface tells you when it's time. Water that once beaded up starts soaking in, the color looks flat, or algae returns faster than it did right after sealing. Those are signs the barrier is wearing, not that the surface needs replacing.
Our surface cleaning and sealing page covers how we approach the clean-and-seal process, and our surface cleaning in Amherst, Ohio page walks through what a typical patio visit looks like.