3M™ Scotch-Weld™ Plastic & Rubber Instant Adhesive PR40 is a low viscosity instant adhesive. The PR100 instant adhesive is formulated to give exceptional performance on difficult-to-bond substrates, such as EPDM, nylon, polypropylene and polyethylene with use of an appropriate primer. Once applied, the glue has fast handling time and cure to keep jobs moving quickly.