3M Scotch-Weld urethane adhesives 3532 provides fast and strong adhesion to many primed or painted metal and plastic substrates. Formulated to deliver tough structural bonds as well as high peel strength, our two-part, polyurethane adhesive is an excellent solution for a variety of applications, including metal, wood and composites. - 3M Scotch-Weld 3532 brown urethane adhesive is compatible with aluminum, plastic and steel materials with a 24 hr cure time. Provides a 5 - 15 min working time. Works in a mix ratio of 1:1. Delivers great performance with a shear strength of 2000 psi, tensile strength of 3000 psi and peel strength of 25 piw.