Bostik Screed master Rapid Repair Mortar is a rapid curing, sag resistant, cementitious compound with a high polymer content. It is mixed with water and can be applied at any thickness. Excellent slump characteristics enable Bostik Screed master Rapid Repair Mortar to be used in vertical and horizontal applications. For the leveling of steps, pedestals, holes and cracks, and larger uneven areas of any thickness in screed, raw concrete floors, and foundations. Suitable for use in interior applications only. Bostik Screed master Rapid Repair Mortar is not suitable for use as a final floor covering. Bostik Screed master Rapid Repair Mortar is suitable for use with underfloor heating installations provided a surface temperature of 27°C is not exceeded. The heating must be switched off at least 48 hours before and after installation of the floor covering