Custom Building Products RedGard Ready to Use Pink Waterproofing and Crack Prevention Gallon LQWAF1-2A ready to use elastomeric waterproofing membrane for both commercial and residential tile and stone application. Suited for interior and exterior substrates, RedGard creates a continuous waterproof membrane barrier with outstanding adhesion and reduces crack transmission in tile and stone floors. It bonds directly to clean metal drains, PVC, stainless steel and ABS drain assemblies and can be used as a slab on grade moisture vapor barrier under all