A less expensive repair can be done on some plastics using a two-part epoxy filler material, saving you the cost of buying a plastic welder. The prep work is similar to the welding method. We brought the munched front bumper from our Crown Victoria for the students to work on. They began by grinding off the paint and frayed plastic pieces from the repair area and cut a V-shaped groove in the tear in the bumper. Next, the students pinged the bumper by drilling a series of holes on either side of the crack at regular intervals. These holes act like rebar in cement, adding yet another place for the filler to grab onto.