Bondo Rubberized Undercoating produces a textured finish which resists chipping, abrasion, exterior rusting and weathering.Bondo Rubberized Undercoating produces a textured finish which resists chipping, abrasion, exterior rusting and weathering. Provides one-coat build-up with no dripping, running or sagging. The undercoating is excellent for automotive undercarriages and for other uses including protection for posts, tree wounds, roofs and gutters.