3M™ Scotch-Weld™ Instant Adhesive CA8 is a low viscosity instant adhesive. Our CA8 instant adhesive is formulated to give exceptional strength and impact resistance on a wide variety of substrates, including metals, plastics and rubbers. Once applied, the glue has fast handling time and cure to keep jobs moving quickly. - 3M Scotch-Weld instant adhesive CA8 has good adhesion to many metals, plastics and rubbers. Our rapid-set adhesive keeps projects moving forward and productivity high. Our clear formula meets CID A-A-3097, Type II, Class 2.