FREE Ground Shipping on Color Samples & All Orders Over $50

POLY Concrete and Masonry Sealer

5.00 out of 5 based on 1 customer rating
(1 customer review)

SEAL-ONCE® POLY Concrete and Masonry Sealer shields concrete and masonry from water damage and decay by forming a durable coating on the surface. It has enhanced UV inhibitors and provides superior abrasion resistance, offering additional protection against the elements.

The high-quality, long-lasting, water-based polyurethane of our POLY provides exceptional abrasion and UV-resistance, protecting concrete and masonry from weathering, scuffs and scratches, in addition to preventing cracking and spalling by impeding water intrusion.

The UV inhibitors in our POLY prevent the natural color of concrete, brick and masonry from fading. It also prohibits stains caused by chemicals, mold, mildew and algae.

SEAL-ONCE POLY is a water based, ultra-low VOC, non-toxic, low odor formula that can be applied around landscaping or vegetation without causing damage. It is easy to clean and is appropriate for both interior and exterior use.

Recommended Use:
Concrete Driveways Walkways and Steps Garage Floors Poured or Stamped Concrete Pavers Patios Faux and Veneer Stone Bricks Slate Stucco Concrete Block Exposed Aggregate




Product Details

  • Eco-friendly
  • Ultra-low VOC (22g/L)
  • Non-toxic; will not harm pets, plants or marine life
  • Superior abrasion resistance
  • UV inhibitors prevent color from fading
  • Available in Satin or Low Gloss finish
  • Flexible barrier expands and contracts with wood through changes in temperature and humidity
  • Prevents mold, mildew, fungi and algae growth
  • Stabilizes and protects concrete and masonry
  • Prevents cracking, spalling decay
  • Soap & water cleanup


  • 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.

$5 Off your 1st Order.

Sign Up to be a SEAL-ONCE insider and get early access to special offers & new products.