Cemflow Grit Prime Primer to provide a key between non-absorbent existing floors and new underlayment (formerly known as Cemflow Don Grit Prime) You might also be interested in Cemflow TS350 Trowel applied cementitious screed Cemflow Primer Water based polymeric primer Cemflow Base S Cement based self leveling industrial surface system Cemflow GPU Plus Fast setting, self smoothing floor leveling cementitious underlayment