Features and Benefits: Used in many of the bumpers on import cars Has a waxy feel to it and smears or gets hairy when sanded at high speed Use this plastic welding rod with either Polyvance s airless plastic welder or a hot air plastic welder Black color has been added to make more invisible repairs to bumpers and other black polypropylene Each rod measures 12 inches long and is 1/8 thick Works with airless hot-air and nitrogen plastic welders.;Rod diameter fits perfectly into the standard welding tip of Polyvance s Mini-Weld Airless Plastic Welder.;Black pigment added for more invisible repairs on black plastic.