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Deck Sealing & Waterproofing done properly

Sealing and staining are not the same thing. A sealer is a clear or very lightly tinted water repellent. It stops water soaking into the boards, which is what causes checking, cupping and rot, but it offers little UV protection, so the wood will still gray over time. It is the right choice for new cedar you want to keep looking natural, for hardwoods like ipe, and for decks that get restained on a short cycle.

We seal decks across Lake County with penetrating water repellents that soak into the wood rather than forming a surface film. A film is what cracks and peels. Applied to clean, dry wood, a good sealer beads water for a season or two and buys time before the deck needs a full stain.

Why prep is the whole job

Ask a Lake County homeowner when their deck was last sealed and the honest answer is usually never. Water gets into the end grain at the board ends, the screw holes and the ledger board against the house, and that is where rot starts. A sealer is cheap insurance. It is also the one step people think they can skip on a hardwood deck, when hardwood is exactly what a UV-blocking penetrating oil is made for.

Where we do this

We do a lot of this work in Gurnee, Mundelein and Indian Creek, and the central Lake County towns like Vernon Hills and Green Oaks keep us busy through the season. See every town on the areas page, or jump to Deck sealing in Mettawa.

Also worth reading

Deck sealing usually pairs with one of these.

Deck cleaning · Deck restoration · Fence staining

Get a number today

Text a photo of your deck or fence and get a number back. We answer Mon–Sat 7am–7pm.

Text (224) 944-8652

Deck sealing problems we see most

End grain darkening

Board ends and stair treads drink water first. Sealing these is where most of the value is.

Hardwood turning silver

Ipe and cumaru gray fast without a hardwood oil. A thin coat wiped back keeps the color.

New cedar you want to keep light

A clear water repellent with UV blockers holds the natural look longer than leaving it bare.

Cupping boards

Wet on top, dry underneath. A sealer slows the moisture swing that causes it.

Sticky surface from too much sealer

Excess was not wiped off. We remove the residue and reapply thin.

How we do it

  1. Moisture checkThe deck must read under about 15% on a moisture meter. Sealing wet wood traps the water in and the sealer will not bond.
  2. Clean and brightenEven a deck that looks clean has surface oxidation. A percarbonate wash and brightener open the grain so the sealer penetrates.
  3. Mask and protectSiding, doors, planters and the patio below are covered. Sealers are thin and travel.
  4. Apply thin, even coatsPad or sprayer with a back-brush. The wood takes what it can absorb and the rest is wiped off so it does not leave a sticky film.
  5. Dry and test24 to 48 hours before furniture goes back. A few drops of water should bead. If they soak in on a spot, that spot gets another pass.

What affects the price

  • Deck size, railings and stairs
  • Wood type: hardwoods absorb less and need a different product than cedar or pine
  • Whether the deck is bare or already has a compatible penetrating finish
  • How much cleaning and brightening the surface needs first
  • Clear sealer versus a lightly tinted one with UV blockers

See the pricing page for how we quote, or text photos and get a real number.

Stain options

  • Transparent and toner: Shows all the grain, least UV protection, shortest life. Best on new cedar and hardwood.
  • Semi-transparent: Our most common choice. Adds color, shows grain, three to four years on horizontals.
  • Semi-solid: More pigment, hides weathering and mismatched boards, still shows some texture. Good on older decks and fences.
  • Solid: Opaque like paint but breathable. Longest UV life, but it will eventually peel and needs stripping to change. We use it when you want a color.
Natural cedarTransparent to semi-transparent, shows the grain
Honey goldWarm semi-transparent, most popular on cedar
RedwoodSemi-transparent, classic deck tone
WalnutSemi-solid, hides older weathering
Driftwood graySemi-solid or solid, modern look on fences

Timing in Lake County

Our season runs roughly late April through October. Stain needs the wood dry, temperatures between about 50 and 90 degrees, and 24 to 48 hours without rain afterward. In Lake County that means spring and early fall are the best windows, with midsummer jobs scheduled around heat and pop-up storms. We book spring work early because the good weeks fill fast.

Wood types we work on

  • Cedar: The most common deck and fence wood in Lake County. Naturally rot-resistant but soft, so it tears under high pressure. Takes penetrating oil beautifully and holds a semi-transparent tone for three to four years.
  • Pressure-treated pine: Builder-grade decking on most 1990s-and-newer homes. Needs to dry out for months after installation before it will accept stain. Greens up in shade fast. Semi-solid stains hide its uneven color well.
  • Hardwood (ipe, cumaru, tigerwood): Dense and oily, so it absorbs very little. Needs a hardwood-specific penetrating oil applied thin and wiped back. Left bare it goes a uniform silver, which some people want.
  • Composite and PVC: Does not take stain and should not be coated. Needs periodic cleaning with a composite-safe product and low pressure to remove mildew, pollen and tannin stains.

Before we arrive

  • Move furniture, grills, rugs and planters off the deck or away from the fence line the night before
  • Leave an outdoor spigot on and reachable; we bring our own hoses
  • Let neighbors know if we are staining a shared fence, so cars and patio furniture on their side are moved
  • Turn off sprinklers for two days before and two days after
  • Keep pets inside while the cleaner is on the wood and until the stain is dry to the touch
  • If HOA approval is needed for a color, get it in writing before the stain day

Aftercare

After staining, keep furniture and foot traffic off for 24 to 48 hours, longer if it is humid. Rinse pollen and leaves off through the season instead of letting them sit and hold moisture. Move planters and rugs periodically so they do not leave shadows. Rinse the deck each spring with a hose, and when water stops beading on the horizontal boards, that is the signal for a maintenance coat. Done on that schedule, a deck never needs stripping again.

Deck sealing FAQ

Should I seal or stain my deck?

Stain if you want color and UV protection with a two- to four-year cycle. Seal if you want the natural wood look and are fine with the deck graying gradually, or if it is a hardwood deck. A tinted sealer is the middle ground.

How long does deck sealer last?

A clear water repellent typically lasts one to two seasons in Lake County. Tinted sealers with UV blockers last longer. When water stops beading, it is time.

Can you seal a deck right after it is cleaned?

Not the same day. The wood needs to dry out fully, usually two to three days of dry weather. Sealing damp wood is the most common reason a sealer fails.

Is there a sealer that stops the deck from turning gray?

Only stains with pigment stop graying. Pigment is what blocks UV. A clear sealer slows it but will not stop it. If gray bothers you, a natural or honey semi-transparent stain keeps the wood tone.

Deck sealing by town

Every Lake County town has its own deck sealing page.

Deck sealing in Libertyville and all of Lake County

Text a photo of the wood and your town. Quotes usually come back the same day.

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