OPTIMIX SF838 Self-Levelling Screed (Colour)​ is a premium quality pre-mixed mortar consists of special cements, graded fillers, polymers and chemical additives. When mixed with water, it readily blends to produce a flowable and pumpable flooring mortar. It can be applied at thickness between 5mm and 20mm in one operation to provide a levelled and flat floor surface. OPTIMIX SF838 can be applied to all concrete substrates. It is designed to set and gain strength quickly for early foot traffic.