Raeco Sack & Patch is single component sacking mix and topping compound consisting of a uniform, premixed blend of Portland cements and graded washed silica aggregates with polymer modification to promote lasting surface adhesion, for renovation and new construction. Sack & Patch can be applied from feathered edge to 1/2" (12.7 mm.), for thickness greater than 1/2" use appropriate aggregate. Sack & Patch can be used for horizontal, vertical and overhead surfaces. Suitable for interior and exterior use, a sealer or coating is recommended when used for a wearing surface. Sack & Patch contains no gypsum, chlorides, ferrous metals or corrosive agents.