Commercial Grade Countertop Mix is used to create a pre-cast or cast-in-place concrete countertop. This product features a super-plasticizer additive for a flowable mix at a low water-to-cement ratio. Use for pre-cast and cast-in-place applications High flow formula Strip forms in 18 hours after pouring Used to create a pre-cast or cast-in-place concrete countertop Just add water; super-plasticizer additive delivers a high-flow fluid mix at a low water-to-cement ratio that minimizes the need for mechanical vibration for easy shaping Exceed 5,000 psi compression strength in up to 28 days for durability Reduces shrinkage formulation for long-lasting use Strip form in 18 hours - improves productivity Learn more about concrete and cement here in our Buying Guide 80 lb.,Commercial Grade Countertop Mix is used to create a pre-cast or cast-in-place concrete countertop.