A very fast setting hydraulic cement made from a highly specialized cement, admixtures, polymers, plasticizers and finely ground aggregates. Used for stopping water leaks in concrete and masonry. Just mix with water, mold into a plug and force into the hole. Expands as it sets. In just three minutes the leak is stopped. Also good anywhere the benefits of a super strong, fast-setting cement are desired, such as setting posts, railings, bolts or other mechanical anchors. Comes in both bulk packaging and convenient cases.