X 4™ Tile and Stone Mortar 40lb. (Grey)
ARDEX X 4™ is a polymer-modified, thin set mortar for setting quarry, ceramic and most natural stone* tiles over common interior surfaces, including exterior-grade plywood, as well as over exterior concrete and masonry surfaces. ARDEX X 4 also can be used to install porcelain tile over common interior surfaces as well as and exterior, horizontal concrete and masonry surfaces. ARDEX X 4 is recommended for most tile sizes,** including mosaics.