GATOR TILE SAND is a unique mixture of polymer binders and calibrated sand, available, that meets ASTM C144 gradation in Beige, Slate Grey, Ivory and Black Diamond. Once GATOR TILE SAND sets, it becomes very firm and locks between the tile joints while still retaining flexibility and providing a long lasting, durable jointing material. GATOR TILE SAND is recommended for a variety of pedestrian uses including pool decks, patios, footpaths etc. This product is for use exclusively with the Gator Tile System and Gator Base. It is not for use with porcelain tile laid directly on concrete, or directly on an aggregate or sand base or bed.