One-component primer based on polyurethane resins in an organic solvent. Recommended for protecting substrates made of cement screeds and concrete against capillary moisture penetration up to 4% (CM method), on which wooden floors will be glued using polyurethane and epoxy-polyurethane adhesives (e.g. BONIPUR PARKIET 2k, BONIPOX PARKIET 2k and BONIPOX PARKIET 2k ECO). ). The condition for obtaining a moisture barrier is to apply the resin twice, the second time across the first layer. BOPREM PU-60, when applied once on substrates (cement and anhydrite screeds, concrete), can be used as a primer before applying polyurethane, polyurethane-silane and epoxy-polyurethane adhesives, one-component and two-component (1k and 2k). The preparation penetrates deep into the primed substrate, strengthens it, while binding residual dust and micro-dusts. It is suitable to hot water underfloor heating. The product has a very limited odor.