Ready-to-go, single-component, semi-liquid compound based on polymer dispersion. After drying, the compound creates a highly elastic, tight, water-repellent coating with good adhesion to the substrate. Intended to provide a waterproof coating under ceramic wall and floor tiles indoors with increased humidity: bathrooms, showers, toilets, laundry rooms, basements, kitchens, sink basins, vegetable sorting areas, catering facilities, etc. Applied to substrates: concrete, cement , lime-cement plaster, masonry with full joints, walls made of silicate and fired brick, and aerated concrete. Cement fiber boards, drywall, plywood and OSB. Concrete, cement, and anhydrite floors.