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POLY Concrete & Masonry Sealer

Eco-Friendly, Low-VOC - Superior Abrasion & UV-resistance

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  • Concrete Driveway
  • Walkways & Steps
  • Garage Floors
  • Stamped Concrete
  • Pavers & Bricks
  • Slate & Stucco
  • Concrete Block
  • Faux/Veneer Stone
  • Poured Concrete
  • Sandstone


  • Water-based, Ultra-Low VOC
  • Eco-friendly, Non-toxic, No Odor
  • Won't harm people, pets or plants
  • Superior abrasion resistance
  • Non-yellowing formula
  • Creates flexible, breathable barrier
  • Prevents mold & mildew growth
  • High impact resistance
  • UV barrier prevents color fading
  • Easy soap & water clean-up

APEO free, Single Component, Water-based, Low-VOC Aliphatic Polyurethane


SEAL-ONCE® has been leading the innovation in the use of nanotechnology to create long-lasting, Eco-friendly wood sealers & tinted wood stains since 2005.  SEAL-ONCE® POLY Concrete & Masonry Sealer shields concrete & masonry from water damage & decay by forming a strong, durable and flexible coating on the surface.

The enhanced UV inhibitors & superior abrasion resistance offer the highest level of protection against the elements.  POLY is a single component, water-based aliphatic polyurethane that is APEO free. It is an Eco-friendly, ultra-low VOC product that does not contain mercury, heavy metals or silica like many polyurethanes on the market today.  It will not harm pets, plants or people & is safe to use near water or gardens.  It is a non-toxic, low odor formula that dries quickly & provides superior adhesion.

It is easy to clean and is appropriate for both interior and exterior use.  POLY is available in a Satin finish that applies milky white and dries clear. POLY prohibits mold & mildew growth and has UV blockers to prevent color fading.  It will not alter the color of the concrete, yellow or discolor over time like many solvent based products.

Product Details

  • 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 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 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.
  • Apply two coats 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.
  • Allow first coat to dry completely before applying a second coat. First coat should be dry within 2 hours.
  • Apply second coat following the same instructions as for the first coat.
  • If more than 24 hours have passed before applying the second coat, scuff sand the first coat to ensure proper adhesion.
  • For best results, apply in the shade and out of direct sunlight.
  • Apply to all surfaces.
  • Do not use with other waterproofing products.
  • Allow approximately 4-6 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 applying second coat, ensure first coat has dried completely and is dry to the touch. Allow approximately 2 hours before second coat.
  • Clean all application equipment with warm soapy water.
  • Disposal: soap and water clean-up; no special disposal procedure needed.
  • Store above 32°F/0°C to protect from freezing.
  • Shelf life (unopened): 12-18 months
Surfaces that have been treated with SEAL-ONCE 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. SEAL-ONCE 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 SEAL-ONCE POLY.

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