How to Stain Wood and Finish Decks

Why this matters

Deck + fence staining is the highest-attach-rate painting upsell at any exterior visit. Quote it whenever the painter is on a property with wood horizontal exposure. A typical deck refinish is + repeats every 2-4 years. Customer gets a fresh-looking outdoor space; painter gets a recurring revenue stream that requires no major equipment beyond standard tools.

Done wrong (no clean, no strip of failing stain, wrong product), the finish peels within one season + the customer demands a redo.

Stain types + when to use each

Key trade-off: more pigment = longer life but less wood grain visible. Educate customer; they often want "natural" but expect 5-year life - incompatible expectations.

For high-sun horizontal surfaces (deck boards) penetrating + transparent stains fail in 18 months. Recommend semi-transparent minimum.

When to stain vs strip + restart

Stain over existing finish:

• Existing finish is intact + same product line
• Light wear, no peeling
• Same color or darker

Strip + restart:

• Existing finish peeling or alligatored
• Different chemistry (oil-based existing + want water-based new)
• Going lighter than current color
• Customer wants different sheen

Stripping is 60-70% of the labor on a restoration deck job. Quote accordingly.

Tools + materials

• Pressure washer 2,500-3,500 PSI (electric or gas)
• Deck cleaner (oxygen bleach: OxiClean or proprietary; or sodium percarbonate)
• Deck brightener (oxalic acid - neutralizes after stripper)
• Deck stripper (sodium hydroxide / NaOH for solid stains; sodium percarbonate for semi-transparents) if existing finish needs to come off
• Stiff scrub brush + extension pole
• Stain (Cabot, Behr Premium, Sikkens, Sherwin-Williams SuperDeck)
• Stain brush (oil) or pad applicator + 4" mini-roller (water)
• Drop cloths + plastic sheeting for plants
• Painter's tape
• Respirator (organic vapor cartridge for solvent strippers + oil stains)
• Eye protection + gloves
• Hose with quick-connect

Procedure (typical deck restoration)

Step 1: Inspect + plan

1. Walk the deck
2. Identify rot, soft boards, popped fasteners
3. Quote board replacement separately (cedar 5/4 board ft material; cumaru/ipe)
4. Re-nail or screw popped fasteners
5. Sweep + remove furniture, planters, grills (or move to far side)

Step 2: Clean / strip

For weathered but unfinished:

1. Wet down deck + adjacent siding
2. Apply deck cleaner (oxygen bleach solution); let dwell 15 minutes; agitate
3. Pressure wash at 2,500 PSI, 12-18" from board, fan tip
4. Rinse thoroughly

For peeling existing finish:

1. Wet + apply stripper per label
2. Dwell 30-45 minutes (don't let dry - re-wet if hot)
3. Pressure wash off
4. Apply brightener to neutralize stripper + restore wood pH
5. Rinse thoroughly

Step 3: Sand if needed

Heavy traffic boards may need 60-80 grit pole sanding to remove furring (raised grain).

Hand-sand rails + spindle tops.

Step 4: Dry

Wood moisture below 15% before staining. Most products call for 24-48 hours dry after wash.

• Sunny + breezy: 24 hours typical
• Shaded + humid: 48-72 hours
• Verify with moisture meter () for accuracy

Staining wet wood = stain doesn't penetrate + peels in months.

Step 5: Mask + protect

• Tape house siding at deck transition
• Plastic sheeting on plants + adjacent stone/concrete
• Drop cloths on walkways

Step 6: Apply stain

Oil-based stain:

1. Brush, pad, or roll
2. ALWAYS wet-edge into next board (no laps)
3. Work 2-3 boards at a time, full length
4. Back-brush spray application - penetration matters
5. One coat usually; second only if penetrating stain + wood very dry
6. Wipe excess from horizontal surfaces (puddles = peeling)

Water-based stain:

1. Same technique
2. Dries faster - keep wet edge tight
3. Second coat after dry-to-touch (typically 2-4 hours)
4. More forgiving of light overlap; still keep wet edge

Railings + vertical surfaces:

• Drips + runs ALWAYS - brush them out immediately
• Stain top of cap rail last (collects runs from spindles)
• Don't forget under rails + ends of boards

Step 7: Cure + customer

• Light foot traffic: 24-48 hours
• Furniture back: 72 hours minimum
• Full cure: 7-14 days
• Hand customer care sheet

Acceptance criteria

• Uniform color, no lap marks
• No puddles or drip lines
• All wood surfaces covered (including ends + undersides where accessible)
• Adjacent surfaces unstained
• Customer signed + scheduled next maintenance

Common pitfalls

• Staining wet wood: peels in 90 days
• No stripper before recoat: peels at the old layer
• Overapplication on horizontal: puddles = tacky for weeks, then peels
• No brightener after stripper: stain darkens too much + uneven
• Wrong product mix: oil-based stain over water-based fails immediately
• Skipping board replacement: customer expects deck life extension; rotten board fails next year regardless
• No customer care sheet: BBQ on day 4 leaves a permanent footprint

Safety considerations

• Pressure washer: 2,500 PSI can cut skin. Never point at people, pets, electrical
• Stripper chemicals: caustic. Full PPE - gloves, eye protection, long sleeves
• Oil stain rags: SPONTANEOUS COMBUSTION risk. Lay flat to dry OUTSIDE on concrete, then dispose in metal can with lid. House fires from balled-up oil rags in a trash bag are real
• Respirator for solvent strippers + oil stains
• Hot wood under stain: blistering possible; stain in shade or cooler hours
• Working on slick deck: non-slip shoes during application

References

• Forest Products Laboratory (USDA) Wood Finishing Guidance
• Stain manufacturer technical sheets (Cabot, Sikkens, Sherwin-Williams)
• NWFA (National Wood Flooring Association) reference for hardwoods
• Manuall internal: Exterior Painting Process SOP