3M Scotch-Weld SF20 Adhesive 20g 3M? Scotch-Weld? Super Fast Instant Adhesive SF20 is a low viscosity instant adhesive. Our SF20 instant adhesive is formulated to give exceptional performance on difficult-to-bond substrates with use of an appropriate primer. Once applied, the glue has fast handling time and cure to keep jobs moving quickly. Super-fast curing keeps projects moving forward and productivity high. Flexible container to pinch a precise drop or squeeze for a steady bead. Bonds to a variety of substrates ? leather, cork, plastic and rubber. Meets CID A-A-3097, Type II, Class 1. 20g bottle.