Seal Once Nano+Poly Premium Wood Sealer 5 Gallon Pail Clear Only

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Seal Once Nano-Poly Premium Wood Sealer combines our proprietary nanotechnology formula with the strength of polyurethane to provide 360° of protection. Now available in Clear and Ready Mixed Colors! The NANO creates a durable finish that allows wood to expand & contract, while the POLY adds surface protection against wear & tear in high traffic areas.

Unlike many sealers that only form a top-coat, NANO+POLYTM penetrates below the surface to form a long-lasting, water-resistant shield around the wood fibers at the cellular level.  This penetrating protection from water intrusion helps resist wood rot, decay, mold & mildew.  It also stabilizes wood, eliminating warping & cupping.   It is a great investment to preserve old or new wood & extend its natural life for years.

When used as a wood stain, Seal Once Nano-Poly Standard Colors provides added UV protection.  NANO+POLYTM has no toxic chemicals like many oil & solvent based sealers,  so it can be applied around your home, landscaping, vegetation or over water safely.  Warranted to prevent long-standing water accumulation for up to 10 years on vertical & 6 years on horizontal surfaces.


  • Decks & Fences
  • Wood Siding
  • Log Homes
  • Outdoor Furniture
  • Swing Sets
  • Pergola
  • Thermally Modified Wood
  • Shakes


  • Water-based, Ultra-Low VOC
  • Eco-friendly, Non-toxic, No Odor
  • Won’t harm people, pets or plants
  • Penetrates below the surface
  • Creates flexible, breathable barrier
  • Helps resist mold, mildew & wood rot
  • Stabilizes wood from warping
  • Extends natural life of wood
  • Easy soap & water clean-up
  • Clear allows the wood to grey naturally

Additional information

Weight 42 lbs