Smooth and level internal subfloors up to 6mm thickness with grey Bostik Cempolay Self-Levelling Compound. This quick-setting, self-smoothing compound has a walk on time of just 2-4 hours. It can also be poured up to 15mm when filled out with grit sand. Protein-free Bostik Cempolay self-levelling compound is suitable for use on concrete, sand/cement screeds and unglazed ceramic tiles. It is also suitable for use in hygiene and food preparation areas.