Acouslime FAST FLOW Self Levelling Cement is a blend of Portland cement, graded aggregates and additives designed to give a self-levelling finish as a floor underlayment used in conjunction with 001 Bond Primer. It is rapid setting and open to light foot traffic in 4 hours. Superior crack resistance due to low shrinkage and exceptional bond. Used in indoor areas over concrete substrates. It is pumpable or can be mixed with a shear blade mixer and placed manually to a thickness up to 10mm.