Professional-grade cementitious waterproofing coating used by contractors for over 85 years. Thoroseal is a crystalline/cementitious compound that penetrates and bonds to concrete and masonry — becoming part of the structure rather than sitting on top. Resists up to 7 PSI of hydrostatic pressure. Mixed with water and applied by brush. One 50lb bag covers approximately 50 sq ft in two coats.
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