Tower Tech²™ is a one component, high-performance, gun-grade, acrylic urethane elastomeric sealant. Formulated from premium technology reduces dirt pickup, eliminates yellowing and shiners. Internally plasticized resin requires no mixing or priming to bond to most materials, including concrete, wood and masonry. Tower Tech²™ has superior adhesion, durability with 50% joint movement capability and 800% elongation. It forms a flexible, durable airtight, water-resistant seal offering exceptional protection. Once cured the bead is mildew-resistant. Tower Tech²™ is safe for UV exposure and will not discolor.