NS 40 Self Levelling - 20kgNormal Set 40 is a self levelling modified cementitious underlay. Normal Set 40 is a rapid hardening self levelling single component cementitious underlay. Normal Set 40 has been formulated to achieve a smooth flat surface with ease of application and maximum flow without any shrinkage or cracking. Features & Benefits Accepts foot traffic within 2 hours at 20C. Reinstating large areas in relative short time periods. Very fast application.