MONEY BACK GUARANTEE * USER-FRIENDLY - Non-toxic, non-flammable, zero VOC"s. * EASY TO APPLY - Spray, roll, or brush. * PERMANENT - No reapplication needed. * PENETRATES - Does not leave a coating. Works by absorbing and reacting inside concrete. * Seals Concrete against Water Seepage, Vapor Transmission, and even Radon Gas * No messy mixing, no sticky residue left behind, RadonSeal® is ready to apply upon delivery.