Logic Sand® Pro Polymeric Sand from Angelus® is a unique mixture of polymeric binders and ASTM C144 graded sand that provides a stronger and longer lasting joint between interlocking concrete pavers exposed to normal traffic. Applied dry, it hardens after being activated with water. Once Logic Sand Pro® sets, it becomes very firm and locks between the paver joints while still retaining flexibility and providing a long lasting, durable jointing material. It allows joints to resist erosion, weeds, and insects. Uses: Can be used for joints up to a maximum of 1 inch For interlocking concrete pavers For standard installations with narrow joints For driveways, walkways, patios, etc. Non-vehicular commercial projects Helps prevent erosion due to wind, rain, and freeze-thaw cycles Helps prevent weeds and damage caused by burrowing insects Haze-free