3M™ Scotch-Weld™ Instant Adhesive CA100 is a medium viscosity instant adhesive. Our CA100 instant adhesive is formulated to give exceptional strength and impact resistance on a wide variety of substrates, including plastics and rubbers. Once applied, the glue has fast handling time and cure to keep jobs moving quickly. - 3M Scotch-Weld instant adhesive CA100 is a high strength cyanoacrylate adhesive. Its relatively high viscosity (approximately 3000 cp) allows gap-filling capability up to 0.02 Inch.