FiberFlex is an "Universal" rod. It is not a true fusion weld, though. Instead, the FiberFlex is a hot-melt adhesive that is applied with a plastic welder. So, it is similar to a brazing process. It sticks great to polypropylene and TPO. FiberFlex is formulated with carbon and glass fibers for the strongest, fastest repairs; in many cases eliminating the need for wire mesh re-enforcement. Works especially well on TPO's. Cool it off and sand immediately to a fine feather edge. For use with Urethane Supply Company's Airless Plastic Welder. Each stick is 1 ft. (30 cm) long, approximately 1/8th inch thick by approximately 1/2 inch wide.