Seal-Once - NANO + POLY Premium Wood Sealer - Clear (5 Gallon)

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NANO+POLY™ is a premium waterproofing wood stain & sealer. It combines proprietary nanotechnology with the strength of polyurethane to provide 360° of protection.

Its durable, breathable matte finish protects the surface of the wood against wear and tear, UV fading and water damage. It is currently available in Ready Mix Colors.

  • Added abrasion resistance for high traffic areas
  • Prohibits warping, cupping, mold & mildew staining
  • Ultra low VOC's
  • People, Plant & Pet Friendly

FREE SHIPPING on 5 gallon pails!

1 Gallon - Purchase Here
As low as $292.98

5 Gallon Pail size - Clear Only


  • 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

SEAL-ONCE® NANO+POLYTM 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, the 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 & up to 6 years on horizontal surfaces.

Material Safety Data Sheet
Material Safety Data Sheet
Bronze Cedar SDS
Brown SDS
Cedar SDS
Coastal Gray SDS
Light Brown SDS
Mahogany SDS
Natural SDS
Black SDS


  • All surfaces should be cleaned before sealing for best penetration and performance.
  • Wet the surface.
  • Clean the surface with a solution of 1 cup Seal-Once Wood Cleaner to 1 gallon of water. Apply this solution to the wood with a garden pump sprayer.
  • Let the solution sit for 15-20 minutes. Do not let the cleaner dry.  Keep it wet.
  • Power wash the cleaning solution from the wood. To prevent damaging the wood do not exceed 500psi.  Keep the nozzle 1-2 feet away from the surface.
  • Rinse thoroughly.
  • Let the surface dry 1-2 dry days before application of Seal-Once.
  • 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.

How to Apply:

  • 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 imminent. For all stains (including Ready-Mixed), intermix gallons and stir to ensure color consistency.
  • DO NOT THIN. Mix well. Stir contents or shake thoroughly prior to use.
  • Test a small area to ensure acceptable appearance and penetration.
  • 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.
  • Second coat can be applied once first coat has penetrated but is still damp. Second coat must be applied within one hour of applying first coat.
  • For best results, apply in the shade and out of direct sunlight.
  • Apply to all surfaces. Apply SEAL ENDS ONCE® to wood ends.
  • Do not use with other waterproofing products.
  • Remove excess stain sitting or puddling on the surface. Back brush or use a rag to wipe away any runs, drips, or puddles that have not soaked in.

Dry Time/Clean UP:

  • Allow approximately 3-4 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, apply once previous coat has penetrated and surface is damp, not wet. Second coat must be applied within one hour of applying first coat.
  • Clean all application equipment with warm soapy water.
  • Disposal: soap and water cleanup; no special disposal procedure needed.
  • Store unused product above 32°F/0°C to protect from freezing.
  • Shelf life (unopened): 2 years

Shipping Details Free Ground Shipping of 5 Gallon Pails
Offering free ground shipping for 5 gallon pails of this product that is shipping to the Lower 48 United States. This FREE OFFER does not apply to Alaska, Hawaii, and the US Territories.

Shipping is provided by Fed-Ex Ground for single gallon purchases and many times ships the same business day if ordered before noon EST. Most always 1-3 business days shipping standard.

All gallon cans will have a protective plastic rings applied to the lid ring for shipping. Protective foam inserts top & bottom of box on single and 2-pack gallon purchases.
Manufacturer U-C Coatings
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