Flat Out Countertop MixCLICK HERE FOR INSTRUCTIONAL VIDEO Designed for quick production and pre casting of countertops, tabletops, concrete panels, and other architectural precast shapes and pieces. A fast setting two component cementitious concrete mix, with pieces able to be de molded in a little as 3 hours and polished in 9 hours. A glass fiber reinforced, polymer modified, self consolidating mix with a 28 day compressive strength of approximately 11,000 psi. Wide range