Free & Same Day Ground Shipping  | View Details

RadonSeal PLUS Concrete Sealer

RadonSeal PLUS Concrete Sealer


Concrete waterproofing and radon mitigation in one simple step. Restricts water, water vapor, and radon gas transmission through concrete. Backed by a life time money-back guarantee.

SKU: N/A Categories: ,

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 penetrating up to 4 inches below the surface and expanding to seal the pores and capillaries that make concrete porous. It waterproofs, hardens, and densifies concrete and withstands both negative and positive-side hydrostatic pressure.

Basement Waterproofing Sealer

The strongest and deepest penetrating basement sealer available. Prevent wet basements, mold and mildew growth, musty odors, high humidity, and water damage to flooring, drywall, and furniture. Deep seal your concrete slab and foundation walls with RadonSeal before finishing your basement to protect your investment. Surfaces treated with RadonSeal are ready for paints, adhesives, tiles, overlays, epoxy, urethane, or carpeting.

Radon Mitigation

Reduce radon and soil gases from entering homes, schools, or workplaces, and improve indoor air quality. Use RadonSeal as an alternative to radon extraction systems to save thousands of dollars. Already have a fan-based radon reduction system? Use RadonSeal in conjunction with an existing radon extraction system to further reduce radon levels inside your living space. Apply RadonSeal after sealing cracks, gaps, and voids to reduce your radon level below the EPA’s take action level of 4 pCi/L.

Strengthen & Preserve Your Concrete

Permanently strengthens and densifies concrete surfaces. Ideal for outdoor concrete driveways and aprons, parking garages, seawalls, and other surfaces exposed to salt and freeze/thaw cycles. Protects concrete against cracking, dusting, efflorescence, freeze-thaw damage, road salts, and deicing chemicals.

Eco-Friendly & Easy To Apply Formula

Sealing concrete with RadonSeal is an easy and safe way to protect your family and home. RadonSeal is people, plant, and pet safe. Water-based, zero VOC, no odor, no hazardous solvents, non-toxic, non-flammable. For use on interior and exterior surfaces, walls, and floors.

The Permanent Concrete Sealer

RadonSeal penetrates and reacts with alkalis found naturally in concrete to form cementitious mineral inside the pores which are permanent. No reapplication needed, ever. Resistant to hydrostatic water pressure. Does not form a surface film. RadonSeal will not crack, peel, or fade away.

Ideal for use on basement floors, crawl spaces, basement walls, foundation walls, concrete floors, indoor and outdoor poured concrete slabs, and walls.

Lifetime Money-Back Guarantee

Performance unmatched by any other sealer. Trusted Since 1997.


Indoor Poured Concrete: 200 – 225 sq. ft. per gal

Outdoor Poured Concrete: 175 – 200 sq. ft. per gal

Concrete Blocks: 100-125 sq. ft. per gal


RadonSeal PLUS is recommended for use on concrete blocks, cinder blocks, limestone, indoor poured concrete older than 20 years, and 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.

Please review the Instructions & Application

FAQ: Frequently Asked Questions  (.pdf)


RadonSeal Plus

To learn more, please watch our video about How to seal concrete walls with RadonSeal’s Concrete Sealer.

Brick Sealer
Basement Floor Sealer
Oil Repellent Sealer