Seal Once Nano Poly Premium Wood Sealer

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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. 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.

Seal Once Nano Poly ready mixed colors:

best water stain

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Unlike many sealers that only form a top-coat, Nano Poly 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.

Seal-Once Nano-Poly

Colors provides added UV protection

  • No toxic chemicals
  • Water clean up
  • 6 year limited warranty

Apply wood cleaner before sealing the wood

The Seal Once Difference

Our Made in the USA wood sealers, deck finishes and tinted wood stains perform like oil-based products without any of the odor, toxic chemicals or harmful side-effects. They are water-based, ultra-low VOC, safer for the environment and will not harm people, pets, or plants.  SEAL-ONCE stains and sealers are low odor, easy to apply and cleanup with soap & water. Great for use on wood docks. The stain will not hurt the marine life if it gets in the water below

Safe for the environment and Seal Once is water clean-up

Recommended brush for spreading Seal Once on horizontal surfaces is Shur-line pads


  • 400 sq ft per gallon on smooth surfaces
  • 150-250 on rough sawn surfaces

Recommended uses of Seal Once:

  • Decks & Fences
  • Wood Siding
  • Log Homes
  • Outdoor Furniture
  • Swing Sets
  • Pergola
  • Thermally Modified Wood
  • Cedar shake roofs

FEATURES & BENEFITS of Seal Once Nano Poly:

  • 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

Seal Once Nano-Poly

  • Helps resist mold, mildew
  • Stabilizes wood from warping
  • Extends natural life of wood
  • Easy soap & water clean-up
  • Clear allows the wood to grey naturally

Seal Once Nano is Trusted by Supreme Deck

Additional information

Weight 9 lbs
Dimensions 9 × 9 × 9 in

Black, Bronze Cedar, Brown, Cedar, Clear, Coastal Grey, Light Brown, Mahogany, Natural, Redwood