MARINE with NANO GUARD Concrete and Masonry Sealer

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SEAL-ONCE® MARINE with NANO GUARDTM Concrete and Masonry Sealer deeply penetrates the surface to protect concrete and masonry against weather and caustic conditions, including salt water spray. This formula uses proprietary nano-polymers to create a flexible breathable barrier that bonds within the capillaries of the concrete to provide lasting protection from the inside out.

Use MARINE with NANO GUARD to preserve the integrity and stability of your project by eliminating cracking, spalling and decay, and inhibiting mold, mildew, algae and fungi growth. MARINE with NANO GUARD is completely eco-friendly, with zero VOCs, and is safe to use around open water, marine life, pets and plants.

Our clear, non-film forming and non-yellowing formula will not alter the appearance of concrete, pavers, bricks or masonry.

Recommended Use:
Docks and Piers Patios Retaining Walls Walkways and Steps Pavers Concrete Floors 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, plants, people or marine life
  • Non-film forming, breathable barrier
  • Prevents cracking & spalling
  • Prevents efflorescence
  • Prevents mold, mildew, fungi & algae growth
  • Stabilizes & protects wood
  • 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 MARINE with NANO GUARD immediately on dampened surface.
  • Apply to all surfaces.
  • Do not use with other waterproofing products.
    The 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 clean-up; no special disposal procedure needed.


Surfaces that have been treated with SEAL-ONCE MARINE with NANO GUARD 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 concrete or masonry 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 concrete or masonry surface. MARINE with 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 MARINE with NANO GUARD.

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