1 Gal 77042 USC CarGroom Short-Strand superior strength formula handles tough repair jobs better than ordinary plastic body fillers. Easy mixing and easy sanding properties make quality repairs easier to do at home. Plus, it is rustproof and waterproof to ensure durable repairs. CarGroom Glass™ Short-Strand fiberglass-filled filler is ideal for moderate repairs to rusted areas, holes and tears on metal or fiberglass surfaces. Packaged in a contemporary one-Gal green can with a cream hardener. By CarGroom.