Masterseal 590 

MASTERSEAL 590 is a single component hydraulic cement-based, fast-setting, repair mortar that instantly stops running water or active moisture seepage though holes or cracks in concrete or masonry. Easy to use, it requires no special equipment. It is powder that typically set in 3 to 5 minutes when mixed with clean potable water.

Actual setting time depends on the temperatures of the powder, mixing water, ambient air and surface (see Temperature). MASTERSEAL 590 expands as it sets to lock into place even under constant water pressure. MASTERSEAL 590 repairs have exceptional strength and durability and will seal out water for life of the structure. MASTERSEAL 590, containing no metallic aggregate or corrosive agents, will not shrink or oxidise, and is suitable for water immersion service when cured.

Certified by National Sanitation Foundation (NSF) to conform to the requirements of NSF Standard 61 for Drinking Water System Components.