Xtreme PreCast Concrtete Countertop Mix from SureCrete Xtreme PreCast - Concrete Countertop Mix it's a hybrid GFRC, dual component, pourable precast concrete bag mix. An excellent choice for concrete countertops, fireplaces, wall panels and other designs. The high early strength and 6-12 hour cure time allows fo fast production and turnaround. Xtreme PreCast concrete countetop mix is the optimal choice to create SureCrete's "Veining" concrete countertop look. Xtreme PreCast Concrete Countertop Mix requires 1 Gal Xtreme Counter Top Modifier (10 lb) MIXING RATIO 1 gal (3.8 L) XS Precast Modifier to 1?50 lb (22.7 kg) bag of XS Precast + up to 16 oz. (0.5 L) water COVERAGE One 50 lb (22.7 kg) bag of XS Precast = approx. 9.8 ft2 @ oe" (0.9 m2 @ 12.7 mm) 7.2 ft2 @ " (0.64 m2 @ 19 mm) OR 0.43 ft3 (0.01 m3)