Raeco R-50 is a two component, concrete repair and topping compound consisting of a uniform, premixed blend of Portland cements and graded washed silica aggregates with a liquid latex modifier to promote lasting surface adhesion, for renovation and new construction. R-50 can be applied from feathered edge to any depth, for thickness greater than 1/2" (12.7 mm.) use appropriate aggregate. R-50 should be used for horizontal surfaces. Suitable for interior and exterior use, a sealer or coating is recommended when used for a wearing surface. R-50 provides excellent freeze-thaw resistance against the penetration of deicing salts and other contaminants. R-50 contains no gypsum, chlorides, ferrous metals or corrosive agents.