Trusted Since 1997 - RadonSeal offer contractors and homeowners unbiased expertise, unparalleled service, and our industry leading sealers and repair products. RadonSeal Deep-Penetrating Concrete Sealer is formulated to permanently seal poured concrete and concrete blocks. RadonSeal Penetrates into concrete (up to 4”), chemically reacts, and seals the capillaries and pores that make concrete porous. RadonSeal restricts moisture, water vapor, and radon gas infiltration through concrete. Prevents efflorescence, dusting, dampness, and humidity. Use RadonSeal to strengthen deteriorating concrete, harden compromised pours, and prevent pitting & spalling due to freeze-thaw, road salts, and deicing chemicals. ZERO VOCs. Eco-friendly. Safe Use Indoors. RadonSeal PLUS is formulated for concrete blocks, interior concrete > 20 years old; exterior concrete > 3 years old; and concrete with a history of seepage, regardless of age. RadonSeal STANDARD is for interior concrete < 20 years old; and interior concrete < 3 years old. USES: Basement floors, foundation walls, driveways, sidewalks, patios, garage floors, building facades, concrete barriers, and carports. (Note – Polished and other smooth-troweled surfaces may require etching or grinding).