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How to stain a deck
Deck stain only lasts as long as the prep is good. Skip the cleaning and the new stain will start peeling next summer. Do the prep right and the same stain lasts three to five years. The work is in the prep, not the brush.
The Honest Read
What this job actually involves
The biggest mistake is staining over a dirty, weathered, or unfinished surface. Stain has to absorb into the wood — if the surface is sealed with old finish, mildew, mill glaze, or dirt, the new coat just sits on top and peels off the first time it rains hard.
Picking the right stain matters too. Clear sealers let wood gray naturally and last 1–2 years. Semi-transparent shows wood grain, lasts 2–3 years. Solid hides grain like paint, lasts 4–6 years but peels when it fails (instead of fading gracefully). Pick based on how often you want to redo this job.
Weather makes or breaks the application. Don't stain in direct sun (drives the stain out of the wood before it soaks in), don't stain when rain is forecast in 24 hours, and don't stain when wood temperature is below 50°F or above 90°F.
What you need
Tools & materials
Shop the supply side here. The big-ticket stuff and the brand-restricted items, we'll point you local further down.
Tools
- Pressure washer (rented or owned — 2000+ PSI)
- Stiff bristle deck brush (long handle)
- Garden sprayer (for applying cleaner/stripper)
- Sander or sanding pole (if dealing with old failing finish)
- Stain pad applicator or quality brush
- Drop cloths, plastic sheeting, painter's tape
Materials
- Deck cleaner (oxygenated, for general cleaning)
- Deck stripper (only if removing failed solid stain)
- Wood brightener (after stripping — neutralizes the wood and opens the grain)
- Deck stain (oil-based or water-based, semi-transparent or solid)
- Sandpaper or sanding screens (60-80 grit for prep, 100 grit for smooth finish)
The Steps
Prep, stain, dry
01
Inspect and repair first
Walk the deck. Replace any rotten or split boards. Sink any popped nails or replace with deck screws. Check the railings and stairs for stability. There's no point staining bad wood — replace it now, while the deck is dirty anyway.
02
Clean (or strip)
If the deck is just dirty and weathered: apply oxygenated deck cleaner with a garden sprayer, scrub with a stiff brush, rinse. If old solid stain is peeling: apply deck stripper, let it work, scrub, rinse — sometimes twice. If the deck is gray and fuzzy: use a wood brightener after cleaning to restore the natural color and open the pores.
03
Pressure wash carefully
Fan tip (not jet), 12″ from the surface, with the grain. Too close or with a narrow tip and you'll fuzz the wood — leaves a permanently rough surface that holds dirt. The pressure washer is for rinsing the cleaner away, not for scouring the wood.
04
Let it dry — really dry
Wood needs to be under 15% moisture before stain will absorb. That's typically 48–72 hours of dry weather after pressure washing, longer if humid. Cheap wood moisture meter ($20) takes the guessing out. Don't rush this step — wet wood rejects stain.
05
Sand if needed
After pressure washing, the surface may be a little raised or fuzzy. A quick pass with a sanding pole (60-grit screen) smooths it back down. Sand high-traffic boards more aggressively. Vacuum or blow off all dust before staining.
06
Apply stain in shade, with the grain
Two thin coats beats one thick coat. Brush or pad the stain on, going with the grain, doing 2–3 boards at a time end-to-end to keep a wet edge. Back-brush after rolling. Don't let stain puddle — wipe excess immediately. Let the first coat dry per the label (usually 2–4 hours for water-based, 24 hours for oil), then second coat.
Try local first · We'll wait
Why local paint stores beat big-box for deck stain
Deck stain is one of those products where formulation matters more than brand recognition. Local paint stores carry products tuned for your climate and your wood.
- Deck stains formulated for your climate (humid/dry, hot/cold makes a difference)
- Real wood samples on display — see how each stain looks on cedar, pressure-treated pine, redwood
- Sherwin-Williams, Benjamin Moore, Cabot, Penofin — authorized dealers stock the contractor-grade products
- Refill containers and color matching for touch-ups two years from now
- Real expert advice on prep, application, and what's caused failures on similar decks
When to call a pro
Hire a deck refinisher if: the deck has structural rot or soft spots that need lumber replacement; it's a second-story deck and you're not comfortable on a long roller pole at height; the previous stain is failing badly and stripping it is a multi-day job; or you have over 1,000 sq ft to do. Pro deck refinishers can knock out in two days what would take you two weekends.
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