Thompson's® WaterSeal® Semi-Transparent Wood Sealer

Available Colors

Chestnut Brown
Coastal Gray
Harvest Gold
Desert Tan

Thompson’s® WaterSeal® Semi-Transparent Wood Sealer provides long-lasting exterior wood protection. Semi-Transparent opacity adds moderate color and shows medium wood grain.
 

Key Features

  • Guaranteed 5 years on decks, 7 Years on fences and siding*​
  • Exceeds industry standard for ASTM-D4446 for waterproofing wood
  • Lightly tinted sealer and sunblock protects wood and enhances the wood grain
  • Helps prevent water damage
  • Provides a mold- and mildew-resistant finish
  • Durable protection from water and sun damage
More Details
Directions for Use

Before You Begin

  • For exterior use only.
  • For wood substrates only.
  • To ensure good penetration, do not apply in direct sunlight or on hot days. Both surface and air temperatures should be above 50°F and below 95°F.
  • Perform the splash test. Sprinkle water on various sections of surface to be sealed. If water absorbs and darkens color of substrate within five seconds, surface is porous and considered ready to be treated. If water beads up or otherwise sits on top of surface, then surface does not need protection at this time.
  • Do not use in below grade application where water pressure is a problem or on painted or recently stained surfaces.
  • DO NOT USE AS AN ADDITIVE TO PAINT.
  • Do not freeze. Do not store below 32°F.

Surface Preparation

  • WARNING! Removal of old paint by sanding, scraping or other means may generate dust or fumes that contain lead. Exposure to lead dust or fumes may cause brain damage or other adverse health effects, especially in children or pregnant women. Controlling exposure to lead or other hazardous substances requires the use of proper protective equipment, such as a properly fitted respirator (NIOSH approved) and proper containment and cleanup. For more information, call the National Lead Information Center at 1-800-424-LEAD (in US) or contact your local health authority.
  • Surfaces and substrates must be free of all mildew stains, dust, dirt, oil, soot, grease and other contaminants.
  • Surfaces must be thoroughly cleaned prior to application with a deck cleaner (like those in the Thompson’s® WaterSeal® cleaner line) applied according to label directions and cautions.
  • Remove all existing loose, flaking or peeling stain. Failure to do so will result in continued flaking and peeling.

Application

  • Do not mix with other waterproofing products; variations in the final appearance of the surface being treated may result.
  • Do not thin.
  • Shake well – intermix all cans (of the same color) to be used to assure color uniformity. Shake or mix thoroughly before and occasionally during use.
  • A small trial patch should be tried before application over the entire surface. Final color appearance differs from initial application.
  • Apply using an exterior paint pad, brush, roller, dipping or compression driven sprayer. If over applied, remove excess before it dries by redistributing to dry areas or wiping off.
  • Keep the leading edge wet and distribute waterproofer evenly. This will help avoid lap marks and keep the color uniform.
  • Work from top to bottom or side to side in areas small enough to allow the leading edge to remain wet at all times during application. Use natural breaks (windows, doors) as boundaries to divide large areas into more manageable work areas.
  • Only one coat is recommended. A second coat can be added if more color is desired. Allow the first coat to dry approximately 2 hours. Second coat must be applied within 4 hours of initial application.
  • Use only with adequate ventilation.

Drying

  • Drying time will vary depending on temperature and humidity.
  • Under normal conditions, Thompson’s® WaterSeal® Semi-Transparent Wood Sealer should dry to the touch within 2 hours.

Clean Up

  • Clean brushes and equipment with soap and water.
  • Read cautions on the handling and disposal of rags.
DANGER: Rags, steel wool, other waste soaked with this product, and sanding residue may spontaneously catch fire if improperly discarded. Immediately place rags, steel wool, other waste soaked with this product, and sanding residue in a sealed, water-filled, metal container. Dispose of in accordance with local fire regulations.
 

Cautions

CAUTIONS: Use only with adequate ventilation. To avoid overexposure, open windows and doors or use other means to ensure fresh air entry during application and drying. If you experience eye watering, headaches, or dizziness, increase fresh air, or wear respiratory protection (NIOSH approved) or leave the area. Avoid contact with eyes and skin. Wash hands after using. Keep container closed when not in use. Do not transfer contents to other containers for storage. FIRST AID: In case of eye contact, flush thoroughly with large amounts of water. Get medical attention if irritation persists. If swallowed, call Poison Control Center, hospital emergency room, or physician immediately. WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. DO NOT TAKE INTERNALLY. KEEP OUT OF THE REACH OF CHILDREN.
 
Chestnut Brown
Coastal Gray
Harvest Gold
Desert Tan
Natural Cedar
Sedona Red

Color accuracy will vary based on monitor and printer calibrations. Please visit your local dealer to view actual color samples before making final decisions.

Also Available

Thompson's® WaterSeal® Transparent Wood Sealer

  • Guaranteed 4 years on decks, 5 Years on fences and siding*
  • Exceeds industry standard for ASTM-D4446 for waterproofing wood
  • Barely tinted sealer and sunblock protects wood and highlights natural wood grain

Thompson's® WaterSeal® Solid Wood Sealer

  • Guaranteed 6 years on decks, 15 Years on fences and siding*​
  • Meets industry standard for ASTM-D4446 for waterproofing wood
  • Boldly tinted sealer and sunblock protects wood and highlights wood texture