Stucco 

Stucco cement is specifically designed for the plastering trade. This product, the result of extensive testing and controlled production, has characteristics desired by the stucco applicator.  Stucco Cement, with proper proportions of sand and clean, potable water provides a smooth, workable mix that retains good consistency and develops a strong bond. While Stucco Cement can inhibit moisture penetration, it is not waterproof and is not to be considered a moisture barrier for design or construction purposes.