Apply 3M Scotch-Weld Urethane Adhesive 620NS, our black, rapid setting, two-part polyurethane based structural adhesive that’s perfect for when you need some flexibility. Our adhesive effectively bonds many substrates such as composites, metals, wood, and many plastics and rubbers, ceramics and glass (may require primer for durability). It features low temperature flexibility, low shrinkage, is non-sagging, and has a long open time, giving you ample opportunity to reposition and adjust work. Use for general bonding and sealing, bonding dis-similar substrates, as a combination structural adhesive and sealant in construction applications, and in prototype building.