Area Floors - Premixed, flexible, water based grouts that don’t ever need to be sealed. Urethane grouts gives you the ultimate color accuracy, stain protection and crack resistance due to its built in flexibility. Unlike Cement grouts, Urethane grouts have only a sanded version (the only type currently available) it can be used on joints as narrow as 1/16. Quartzlock 2 Dimensions - reflective urethane grout for glass tile