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POLY Premium Wood Sealer

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SEAL-ONCE® POLY Premium Wood Sealer shields wood from water damage and decay by forming a durable coating on the wood’s surface. The enhanced UV inhibitors and superior abrasion resistance offer the highest level of protection against the elements.

POLY is a single component, water based aliphatic polyurethane that is APEO free. It does not contain mercury, heavy metals or silica. POLY is a non-toxic, low odor formula that can be applied around landscaping, vegetation or water without causing damage.

The long-lasting, ultra-low VOC, water-based polyurethane protects wood from weathering, scuffs and scratches, in addition to preventing wood rot and decay by impeding water intrusion. It also stabilizes the wood, eliminating warping and cupping caused by water intrusion.

The UV inhibitors in our POLY prevent color fading. POLY also prohibits stains caused by mold, mildew, algae and fungi.

Recommended Use:
Railings Wood Siding Log Homes Fences Outdoor Furniture Planters Play Structures Wood Trim Wood Floors Garage Doors




Product Details

  • Eco-friendly
  • Ultra-low VOC (22g/L)
  • Non-toxic; will not harm pets, plants or marine life
  • Superior abrasion resistance
  • UV inhibitors prevent color from fading
  • Flexible barrier expands and contracts with wood through changes in temperature and humidity
  • Prevents mold, mildew, fungi & algae growth
  • Stabilizes and protects wood
  • Prevents warping, cupping, wood rot & decay
  • Soap & water cleanup


  • All surfaces should be cleaned before sealing for best penetration and performance.
  • Remove all old coatings, dust, debris and loose material. Remove oil, grease, algae, grime, mill glaze and mold and mildew stains with appropriate cleaners. Recommend SEAL-ONCE All Wood Cleaner.
  • Test absorbency after cleaning by sprinkling water on surface. If the water does not readily penetrate the surface, stripping will be necessary to remove old coatings.
  • Do not use if air or surface temperature is below 50°F/10°C or above 95°F/35°C.
  • Do not apply in rain or when rain is expected within 24-48 hours.
  • DO NOT THIN. Mix well. Stir contents or shake thoroughly prior to use.
  • Apply first coat with a synthetic brush; pump-up garden sprayer; air-assisted; and/or airless sprayer. Use 15-17 tip and medium to coarse spray pattern. When spraying, always back brush for best results.
  • Allow first coat to dry completely before applying a second coat. First coat should be dry within 2 hours.
  • Apply second coat following the same instructions as for the first coat.
  • If more than 24 hours have passed before applying the second coat, scuff sand the first coat to ensure proper adhesion.
  • For best results, apply in the shade and out of direct sunlight.
  • Apply to all surfaces and ends.
  • Use only with other SEAL-ONCE waterproofing products.
  • Allow 4-6 hours for surface to dry completely before permitting light foot traffic.


  • Allow approximately 4-6 hours for surface to dry, depending on temperature and humidity, before subjecting to light foot traffic.
  • Allow 24-48 hours for full cure, depending on temperature and humidity.
  • When recoating, ensure first coat has dried completely and is dry to the touch. Allow approximately 2 hours before applying second coat.
  • Clean all application equipment with warm soapy water.
  • Disposal: soap and water cleanup; no special disposal procedure needed.
  • Store above 32°F/0°C to protect from freezing
  • Shelf life (unopened): 12-18 months


Surfaces that have been treated with SEAL-ONCE POLY can be cleaned using a mixture of 1-gallon warm water, 14 oz. bleach, and 1 oz. of Dawn® dish detergent. Apply this cleaning solution with a sprayer and allow to sit for 20 to 30 minutes on the wood surface before rinsing with water using a garden hose with a nozzle.

This cleaning solution can be used to remove airborne mold and mildew stains, dirt and grime from the wood surface. SEAL-ONCE POLY will prevent and resist any water, mold and mildew penetration. Do not use oxidizers, corrosives, or strippers on surfaces that have been treated with SEAL-ONCE POLY.

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