3M Scotch-Weld epoxy adhesive DP405 is a black, toughened, two-part epoxy structural adhesive that provides good strength along with high impact and fatigue resistance to meet demanding bonding challenges. - 3M Scotch-Weld epoxy adhesive DP405 can replace mechanical fasteners, screws, rivets and spot welds in many applications. Adhesive cures at room temperature, making it a convenient and easy-to-use solution for challenging applications.