Formerly known as Thoroseal. MasterSeal 581 is a Portland cement-based coating for concrete and masonry that provides protection against water, dampness, and seepage. Mixed with MasterEmaco A 660, MasterSeal 581 creates a low maintenance and highly durable waterproof barrier that is NSF certified for potable water applications.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.