3M Scotch-Weld Urethane Adhesive EC-3587 B/A B-1/4 and 3M? Scotch-Weld? Urethane Adhesive EC-3587 B-1 are a two-part, urethane adhesive that provides excellent adhesion to many primed or painted metal and plastic substrates. This urethane creates tough structural bonds as well as achieve high peel strength, offering long-term durability for a variety of applications.