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NANO+POLYTM Premium Wood Sealer

5.00 out of 5 based on 2 customer ratings
(2 customer reviews)

SEAL-ONCE® NANO+POLYTM Premium Wood Sealer combines our proprietary nanotechnology formula with the strength of polyurethane to provide 360° of protection. It creates a durable finish that allows wood to expand and contract while protecting against wear and tear.

NANO+POLYTM penetrates to form a long-lasting water resistant shield around the wood fibers, preventing wood rot, decay, mold and mildew. It also stabilizes wood, eliminating warping and cupping.

NANO+POLYTM can be used to preserve old or new wood, extending its natural life. It is UV stable and it has UV blockers to prevent the natural color of the wood from fading. It is also compatible with our Semi-Transparent Tints.

NANO+POLYTM is water based, non-toxic, has ultra-low VOCs and no odor. It can be applied around landscaping, vegetation or over water without causing damage.

Recommended Use:
Decks Wood Siding Log Homes Railings Docks and Piers Fences Exposed Beams Outdoor Furniture Planters Play Structures Cedar Shingles




Product Details

  • Eco-friendly
  • Ultra-low VOCs (37g/L)
  • Non-toxic; will not harm pets, plants, people or marine life
  • Will not peel
  • Abrasion resistance
  • UV inhibitors prevent color from fading
  • Flexible, breathable barrier
  • 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 imminent.
  • 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.


  • 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


  • Surfaces that have been treated with SEAL-ONCE NANO + POLY Premium Wood Sealer 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. NANO + 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 NANO + POLY.
  • Surfaces can be recoated with NANO + POLY at any time. NANO + POLY may need to be reapplied for fading tint color, surface damage, in heavily worn or high traffic areas, or in places where the surface may have undergone noticeable changes.
  • Before reapplying NANO + POLY, clean the surface using the recommended cleaning solution above. Apply NANO + POLY according to package instructions. When reapplying in small areas, lightly overlap onto areas previously treated with NANO + POLY.

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