NANO GUARD PLUS POLY Premium Wood Sealer

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SEAL-ONCE® NANO GUARDTM PLUS POLY Premium Wood Sealer combines our proprietary nano-polymer formula with the strength of polyurethane to provide 360° of protection. Its pliable durable finish allows wood to expand and contract while protecting against wear and tear.

NANO GUARD PLUS POLY can be used to preserve old or new wood, extending its natural life. Its UV inhibitors prevent the natural color of the wood, or our Semi-Transparent Tints, from fading. It also prohibits staining caused by mold, mildew, algae and fungi.

NANO GUARD PLUS POLY is a water based, low VOC, non-toxic, low odor formula that can be applied around landscaping, vegetation or over water without causing damage.

Recommended Use:
Decks Wood Siding Log Homes Docks Piers Fences Structural Framing Outdoor Furniture Planters Play Structures Cedar Shake Shingles and Siding Window and Door Trim (interior and exterior) Flooring Cupboards and Cabinets




Product Details

  • Eco-friendly
  • Low VOCs
  • Non-toxic; will not harm pets, plants, people or marine life
  • Abrasion resistance
  • UV inhibitors prevent color from fading
  • Flexible breathable barrier
  • Prevents mold, mildew, fungi & algae growth and staining
  • Stabilizes and protects wood
  • Prevents warping, cupping, wood rot & decay
  • Soap & water clean-up


  • All surfaces should be cleaned before sealing for best penetration and performance.
  • Clean all 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.
  • Apply first coat with a brush, pump-up garden sprayer, air-assisted and/or airless sprayer. Use 17-19 tip and medium to coarse spray pattern. Brush out any puddles.
  • Allow first coat to dry completely before applying a second coat. First coat should be dry within 1-2 hours.
  • Apply second coat following the same instructions as for the 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, depending on temperature and humidity, before subjecting to light foot traffic.
  • Allow 24-48 hours for full cure, depending on temperature and humidity.
  • When applying second coat, ensure first coat has dried completely and is dry to the touch. Allow approximately 1-2 hours before second coat.
  • Clean sprayer equipment and brushes with warm soapy water.
  • Disposal: soap and water clean-up; no special disposal procedure needed.


Surfaces that have been treated with SEAL-ONCE NANO GUARD PLUS 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. NANO GUARD PLUS 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 GUARD PLUS POLY.

Surfaces can be recoated with NANO GUARD PLUS POLY at any time. SEAL-ONCE NANO GUARD PLUS 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 GUARD PLUS POLY, clean the surface using the recommended cleaning solution above. Apply NANO GUARD PLUS POLY according to package instructions. When reapplying in small areas, lightly overlap onto areas previously treated with NANO GUARD PLUS POLY.