Chapco’s Defender is the proven moisture vapor barrier for the installation of floor coverings, tile, stone and concrete toppings, the company says. Defender is a low-viscosity, high- penetration, two-part 100% solids epoxy that is specially formulated to be applied to moist or new concrete.  Only one coat fills voids/gaps, seals substrates and cures quickly for same day installation, according to the company.