Custom Building Products PMG1221 1 Gallon Pre-Mixed Grout (4 Pack), LinenReady-to-use, no mixing, no mess alternative to traditional grout. Non-shrink and crack-resistant formula is highly-resistant to most common household stains retaining original color for years to come. Ideal for new tile grout installation and restoration of existing tile grout. Grouts ceramic, mosaic, quarry, porcelain, stone tile, marble, and granite. Porous stone can be stained by grout; follow directions in surface preparation instructions. Interior use only. For wall and floor installation not subject to prolonged water exposure or underwater, but suitable for use with tub surrounds and on shower walls. Protected with MoldGard Technology to resist mold and mildew growth.Custom Building Products PMG1221 1 Gallon Pre-Mixed Grout (4 Pack), Linen Features: Grout Pre-mixed grout is the no mix, no mess alternative to traditional grout Shrink and crack resistant Resists most household stains Ideal for grout restoration Protected by MoldGuard Technology to resist mold and mildew growth For interior use only Can be used to grout ceramic, mosaic, quarry, porcelain, stone tile, marble and granite Suitable for wet areas such as tub surrounds and shower walls Not for use in steam rooms, shower floors, areas exposed to prolonged water exposure or underwater