Description Everbuild Accelerator & Frostproofer is a liquid additive formulated to accelerate setting and hardening times of mortar, concretes, screeds and rendering to provide frost protection during the setting period. Effective even in sub-zero temperatures and can also be used in normal temperatures where a rapid set is required and as a plugging admixture. Chloride Free. Areas of Use– Mortars (not metal reinforced)– Floor screeds– External/Internal cement based rendering– Concrete (not structural)– Suitable for use as an emergency repair plugging aid when mixed neat