NANO+POLY Concrete & Masonry Sealer

Superior, Long-Lasting Eco-Friendly, Low-VOC Sealer

4.67 out of 5based on 3 customer ratings
3 customer reviews


  • Brick/Masonry
  • Bricks Pavers
  • Concrete Patios


  • 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 prevent freeze/thaw damage
  • Prohibits cracking, spalling & mold
  • Non-yellowing, Will not peel
  • Easy soap & water clean-up

Clear Matte Finish Will Not Yellow Over Time or Make Surface Slick or Slippery


SEAL-ONCE® NANO+POLY Concrete & Masonry Sealer combines proprietary nanotechnology with the strength of polyurethane to provide 360° of protection. NANO+POLY penetrates below the surface to protect against water damage from the inside-out.

It forms a long-lasting water resistant shield within the capillaries of concrete and masonry, preventing effluorescence, cracking, spalling, mold and mildew growth, lime bloom and freeze/thaw damage.  In addition to penetrating to coat the pores of the concrete, NANO+POLY creates a durable surface coating that protects against wear and tear, and water damage.  It creates a UV-stable, non-yellowing coating that preserves the natural color of the concrete and resists weathering & decay.

NANO+POLY is a water based, non-toxic, eco-friendly sealer that will not harm pets, plants or people.  It goes on milky white, dries clear and cleans up with soap & water.  It is a great investment to protect and extend the useful life of your concrete walkways, patio, pool deck, stamped concrete, bricks, or pavers. Not recommended for concrete driveways or garage floors.

Warranted to prevent long-standing water accumulation for up to 10 years on vertical & up to 6 years on horizontal surfaces. Not recommended for concrete driveways or garage floors.

Product Details

  • 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 Concrete/Masonry Cleaner. Apply this solution to the surface 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 surface. To prevent damaging the surface 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 Nano+Poly Concrete.
  • 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 expected within 24-48 hours
  • 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 should be applied within one hour of applying first coat.
  • Allow 3-4 hours for surface to dry completely before permitting light foot traffic.
  • For best results, apply in the shade and out of direct sunlight.
  • Apply to all surfaces.
  • 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.
  • For surface temperatures that are hot to the touch, dampen the surface to bring the temperature down prior to applying the first coat.
  • When applying in direct sunlight and wood surface is hot, spray with a mist of water and apply Nano Poly Concrete immediately on dampened surface.
  • 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 the first coat.
  • Clean all application equipment with warm soapy water.
  • Disposal: soap and water cleanup; no special disposal procedure needed.
  • Store above 32°F/0°C to protect from freezing.
  • Shelf life (unopened): 2 years
  • Surfaces that have been treated with SEAL-ONCE® NANO+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 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 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.