Mapei Keraquick Zero S1 Grey Rapid Set AdhesiveKeraquick S1 Zero is a powder composed of a blend of special cements, selectively graded aggregates, synthetic resins and accelerators, which develop high bond strength 2 3 hours after mixing. These properties allow floors and walls tiled using Keraquick S1 Zero to be grouted after only 2 hours. Floors can also be subjected to light foot traffic after 2 hours and full service conditions after 24 hours. Where floors are to be subjected to heavy duty