NANO GUARD Concrete and Masonry Sealer

0 out of 5 based on customer ratings
(0 customer reviews)

SEAL-ONCE® NANO GUARDTM Concrete and Masonry Sealer’s nano-polymer formula creates a flexible breathable barrier by permeating the surface and bonding to the structure of the concrete. It works to extend the life of the concrete, masonry and brick by protecting against the most common causes of concrete damage including

  • Freeze/thaw damage
  • Cracking
  • Spalling
  • Efflorescence
  • Stains from salts & chemicals

NANO GUARD Concrete and Masonry Sealer is non-film forming, non-yellowing formula that will not alter the appearance of decorative pavers, stone, concrete, brick of masonry or change over time. It prevents mold, mildew, algae and fungi from adhering to the concrete, preventing stains and long-term damage.

Recommended Use:
Concrete Driveways Patios Walkways Steps Pavers Garage and Basement Floors Clay Bricks Mortar and Grout Tile (unglazed) Stucco Granite (unpolished) Adobe Limestone Sandstone Terra Cotta Exposed Aggregate




Product Details

  • Eco-friendly
  • Zero VOCs
  • Non-toxic; will not harm pets or plants
  • Non-film forming, breathable barrier
  • Non-yellowing
  • Prevents cracking, spalling & decay
  • Prevents mold & mildew growth & staining
  • 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 and mold and mildew stains with appropriate cleaners. Recommend SEAL-ONCE Concrete/Masonry 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 45°F/7.22°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 two coats wet on damp 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.
  • For best results, apply in the shade and out of direct sunlight.
  • When applying in direct sunlight and surface is hot, spray with a mist of water and apply SEAL-ONCE NANO GUARD immediately on dampened surface.
  • Do not use with other waterproofing products.
  • Concrete or masonry can be painted or stained as soon as it dries in approximately 2-3 hours, if Seal-Once Semi-Transparent Tints are not being used.


  • Allow approximately 2-3 hours depending on temperature and humidity before subjecting surface to light foot traffic.
  • Allow 12-24 hours for full cure, depending on temperature and humidity.
  • When recoating, apply as soon as previous coat has penetrated and surface is damp, not wet.
  • Clean sprayer equipment and brushes with warm soapy water.
  • Disposal: soap and water cleanup; no special disposal procedure needed.


Surfaces that have been treated with SEAL-ONCE NANO GUARD Concrete and Masonry 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 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. SEAL-ONCE NANO GUARD will prevent and resist any water, mold and mildew penetration. Do not use oxidizers, corrosives, or strippers on surfaces that have been treated with SEAL-ONCE NANO GUARD.

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