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RadonSeal PLUS Concrete Sealer

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

  • Penetrates Concrete (up to 4″) – Internally Seals the Matrix of Concrete, Blocking 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.
  • ECO-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, and Overlay Flooring.
  • Commercial-Grade Backed by a Money-Back Guarantee – Trusted Since 1997
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Product Description

Building Industry Since 1997

RadonSeal PLUS Deep-Penetrating Concrete Sealer is a water-based, Zero VOC, concrete sealer formulated to permanently seal, strengthen, and protect poured concrete, concrete blocks, and limestone. RadonSeal works by absorbing deep below the surface to seal the pores and capillaries that make concrete porous. It hardens within the concrete as a mineral and withstands both negative and positive-side hydrostatic pressure. RadonSeal is permanent and does not require reapplication. 

Radon mitigation and waterproofing in one simple step!

RadonSeal PLUS protects against water seepage, water vapor transfer, and the migration of radon and other soils gases through concrete walls and floors. Permanently strengthens, hardens concrete surfaces, and protects concrete against cracking, dusting, efflorescence, freeze-thaw, road salts, deicing chemicals, and minor defects. Use RadonSeal before painting, installing flooring, coatings, or overlays to extend the life of these products by reducing negative-side moisture transfer.


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Common Uses

RadonSeal PLUS is recommended for use on concrete blocks, cinder blocks, limestone, indoor poured concrete older than 20 years, outdoor concrete older than 2 years. Alternatively, RadonSeal Standard can be used for indoor poured concrete less than 20 years old, or outdoor concrete less than 2 years old.


  • Strengthens:  Bonds and strengthens concrete, reducing spalling, pitting, and cracking.
  • Permanent:  No reapplication needed. Cannot be pushed out by negative side water pressure.
  • Paintable:  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 profile and porosity.

  • 5 gal:     Poured Concrete: 1,000 sq. ft., Concrete Blocks: 500 sq. ft., Cinder Blocks: 400 sq. ft.
  • 2.5 gal:  Poured Concrete: 500 sq. ft., Concrete Blocks: 250 sq. ft., Cinder Blocks: 200 sq. ft.


Please review Detailed Instructions & Application.

Safety Data Sheet (SDS)    

Product Data Sheet (PDS)

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