3M™ Scotch-Weld™ Urethane Adhesive 3549 is a brown, non-sag, two-component polyurethane adhesive. This urethane adhesive has a 60 minute work life for panel bonding or repositioning. Ideal for bonding dissimilar substrates, such as composites, SMC, FRP, many plastics, ceramic, wood, rubber, and metal.Compared to one part sealants, 3M Scotch-Weld Urethane Adhesive 3549 is fast-curing, establishes tough bonds and offers low-temperature flexibility. 3M Scotch-Weld Urethane Adhesive 3549 becomes a non-sag paste upon mixing for accurate and precise handling during application. This adhesive can be used for bonding dissimilar substrates, such as concrete, ceramic, wood, plastic, rubber, and metal. With a 1:1 mix ratio, this urethane adhesive has a 60-minute work life, reaches handing strength in 8 hours and full cure in 7 days. Two-part urethane adhesives cure chemically, rather than relying on moisture from the air. Urethane adhesives will bond most common materials such as wood, metals, rubbers, leather, tile, glass, many plastics, concrete and more. The versatility of urethane adhesives is exhibited in the different formulations that have varying cured properties such as different levels of stiffness or flexibility, open time and cure speed, and hardness. They can cure to a relatively rigid or highly flexible state to meet a wide range of requirements. In either finished state, urethane adhesives will maintain bond strength integrity through variable environmental factors such as temperature, moisture, and chemical exposure.