Skip the gun, cartridge and tip and switch to U-POL 7061. Fix road rash, hole throughs, and other flexible repairs with 7061 Flexible High Density Body Filler. Versatile enough to use on a variety of substrates, and specially designed for flexible plastics. Solvent proof in 15-20 minutes Ideal for repairing bumpers - feather edges perfectly into plastic and dries very flexible Can be used with mesh for hole through and tab repairs Fast drying and very easy to sand Substrates: TPO, EDPM, polypropylene, other flexible and rigid plastic components, steel, aluminum, galvanized, GRP