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White Crack Prevention Mortar is the ultimate performing lightweight mortar protects against cracks up to 1/8 in. 3 mm. Offers the ultimate in bond strength for the most demanding installation requirements with the flexibility to withstand horizontal substrate movement up to 1/8 in. 3 mm. Formulated with CustomLite technology it’s 40% lighter than other mortars providing excellent handling characteristics and offers non-sag non-slip installation on walls. Diverse in application it is capable of thin-set or medium-bed use up to 3/4 in. 19 mm thick on horizontal surfaces after beat in. Non-slump medium-bed features provide the ultimate support for large format tile and stone. Formulated with premium white cements and select recycled content for a pure white backdrop for the delicate installation of hard-to-bond glass tile. 13.6 kg bag covers the same area as a 50 lb. 22.68 kg bag of traditional mortar. Use for interior or exterior floors countertops and walls.