This tile mortar by Mapei(R) is a regular-setting, polymer-enriched mortar for installing a wide range of tiles and stones over a diverse range of substrates in thin-set applications. With high polymer content, it provides a strong bond and allows for installation over existing tiles. With its smooth and creamy consistency, it is to be mixed with water only and it is easy to apply. This tile mortar is perfect for installing porcelain, ceramic and quarry tiles as well as marble, granite and natural stone. For floors and walls and exterior or interior installations, it can be applied onto most traditional substrates properly prepared. It is best used with tiles up to 15" x 15".