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RadonSeal Standard Concrete Sealer

A water-based penetrating sealer that permanently seals, strengthens, and protects concrete floors and walls. Prevents water, water vapor, and radon gas transmission through concrete. For use on indoor poured concrete less than 20-years old, outdoor poured concrete less than 3-years old, and concrete block.

  • Penetrates Concrete (up to 4″) – Seals Concrete Internally. Blocks the Pores and Capillaries to Prevent Water Seepage, Water Vapor, and Radon Gas. Ideal For Use on Basement Floors, Interior Basement Walls, Foundation Walls, Slab-On-Grade, Indoor and Outdoor Poured Concrete Slabs, and Walls.
  • Hardens & Strengthens Concrete – Helps to Protect Against and Reduce Concrete Dusting, Efflorescence, Damage Caused by Salts, De-Icing Chemicals, and Freeze-Thaw. Does Not Trap Moisture.
  • EARTH-Friendly & Easy to Apply Formula – Zero VOCs, No Odors, No Solvents, Non-Toxic, Non-Flammable. Water-based.
  • Permanent & Paintable – No Reapplication Needed. Resistant to Hydrostatic Water Pressure. Does Not Form a Surface Film. No Peeling or Fading. Leaves Surface Paintable. Great Primer for Epoxies, Tiles, Adhesives, and Overlay Flooring.
  • Commercial-Grade Backed by a Money-Back Guarantee – Trusted Since 1997
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Product Description

Concrete’s Porous. Seal It!

RadonSeal Standard Deep-Penetrating Concrete Sealer is a Solvent-Free, Zero VOC, Non-Toxic, Eco-Friendly, ready-to-use, reactive-based sealer formulated for maximum penetration and sealing of capillaries inside concrete and high-quality cementitious substrates. It works by being absorbed deep into porous concrete (up to 4″), where is chemically reacts with free-lime and alkalis to seal the matrix of the concrete, neutralize, and chemically harden surfaces. RadonSeal is permanent – reapplication is never required.

Waterproofing – Restricts the transmission of water vapor, capillary water seepage, wicking water, radon, and other soil gasses. reduces efflorescence and salt deposits. Protects and improves the lifespan of concrete paints, stains, epoxy & urethane coatings, and concrete levelers against water-induced delimitation and alkali attack.

Strengthens – RadonSeal increases surface hardness (ASTM C 779) which helps protect concrete against cracking, crazing, spalling, and surface deterioration due to vehicular traffic, road salts, freeze-thaw, and deicing chemicals. Use RadonSeal to alleviate concrete surface dusting, before applying paints and epoxy coatings.

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Common Uses

RadonSeal Standard: Recommended to seal indoor poured concrete (less than 20 years old) and outdoor poured concrete (less than 2 years old). Indoor/Outdoor. Commercial/Residential.

  • Alternatively, RadonSeal Plus is recommended for indoor poured concrete (older than 20-years), outdoor poured concrete (older than 2 years old), heavyweight concrete blocks, and cinder blocks (please refer to cinder block instruction).



  • Paintable:  Seal surfaces before paining to reduce efflorescence, and premature paint delamination. Treated surfaces are suitable for epoxy, urethanes, adhesives, and other overlays.
  • Permanent:  No reapplication needed. Cannot be pushed out by negative side water pressure.
  • Non-Slip:  Does not change surface appearance or surface friction. Will not peel, wear away, or flake.
  • Eco-Friendly:  Helps with LEED Certification.
  • Zero VOCs:  Water based, non-flammable, non-toxic, no strong odors or noxious fumes.
  • Protects:  Minimizes efflorescence, concrete dusting, protects against alkali attack, and mold growth.
  • DIY:  Easy spray-on application for homeowners and contractors with use of hand-pump garden sprayer.


Coverage varies depending upon surface texture and porosity.

  • 5 gal:     Poured Concrete: 1,000 sq. ft.
  • 2.5 gal:  Poured Concrete: 500 sq. ft.


Please review Detailed Instruction & Application.


For additional information on the product and its applications visit detailed product webpage.