When mixed with water, MORTAR MIX produces a workable, high quality mortar that is ideal where rapid strength gain, high durability and low shrinkage are desired. Apply MORTAR MIX in thicknesses from 1/2 inch to 6 inches. Durable in wet environments. SETS IN 15 MINUTES AND IS READY FOR TRAFFICE IN ONE HOUR. One 55 lb. bag of Rapid Set MORTAR will yield approximately 0.5 cubic feet. Available in 25 lb. box and 55 lb. bag.