Waterplug is a one-component, quick-setting, Portland-cement-based hydraulic repair mortar that instantly stops running water through holes or cracks in concrete or masonry. It expands as it sets to lock into place even under constant water pressure. It can be applied underwater.
Stops running water instantly. Nonshrinking; expands as it sets and won't pull away from edges of patch. Will set up under water. Sets fasts: 3-5 minutes. Exceptional structural strength. Dry powder form, just add water. Easy-to- mix and put in place; requires no special equipment. Nontoxic when set. Nonmetallic; will not rust out or deteriorate.