Stains & Finishes
Sealers
Thompson's WaterSeal
$18-$40/gal

Exterior Wood Sealer for Waterproof Outdoor Protection

Exterior wood sealers create a protective barrier that repels water and prevents moisture damage on outdoor surfaces. Clear to lightly tinted formulas allow natural wood beauty to show through while blocking harmful effects of rain snow and humidity.

Key Features

  • Waterproof barrier protection
  • UV resistant formula
  • Prevents warping and cracking
  • Clear to semi-transparent finish
  • Mildew and algae resistant
  • One-coat application

Specifications

Coverage: 150-400 sq ft/gal | Dry: 1-2 hrs | Recoat: 24 hrs | Apply: brush roller or sprayer

Best For

All exterior wood including decks fences pergolas outdoor furniture and play structures requiring waterproof protection.

Compatible Materials

Pressure-treated pine
Cedar
Redwood
Douglas fir
Pine
Spruce
Fir

Pros & Cons

Pros

  • ✓ Excellent water repellency
  • ✓ Preserves natural wood appearance
  • ✓ Easy application
  • ✓ Affordable protection
  • ✓ Prevents mold and mildew growth

Cons

  • ✗ No color enhancement
  • ✗ Annual reapplication in harsh climates
  • ✗ Won't cover existing stain
  • ✗ Limited UV protection vs stains
  • ✗ Can slightly darken wood

Installation Tips

Apply to clean dry wood free of moisture for 48+ hours. Pump sprayer for large areas and back-brush for even coverage. Apply liberally. Wipe excess not absorbed within 15 minutes. One coat usually sufficient.

Frequently Asked Questions