3M 3549

3M Scotch-Weld Urethane Adhesive 3549 is a brown, two-component polyurethane adhesive that becomes a non-sag paste after 1:1 mixing for vertical and other bead-controlled bonding. The tough, flexible cured adhesive joins dissimilar materials, including composites, SMC, FRP, plastics, ceramic, wood, rubber, concrete, and metal. Its positioning window allows panel adjustment before set, while low-temperature flexibility suits joints that require a resilient response. The adhesive reaches set or handling strength in 8 hours and full cure in 7 days under the listed timing. It is suited to panel-to-frame, door-frame, and wood-panel bonding where controlled placement and flexible adhesion are important.

Key features

• Non-sag mixed paste: The combined urethane holds its bead in vertical and other slump-sensitive applications.
• Balanced 1:1 mixing: Parts A and B combine at a one-to-one ratio before application.
• Tough flexible cure: The cured adhesive provides flexible bonding and low-temperature flexibility.

Applications

Suitable for bonding composites, SMC, FRP, plastics, ceramic, wood, rubber, concrete, masonry, and metal, including panel-to-frame and door-frame assemblies.