How to Repair Surface Cracks on a Car's Rear Bumper?
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Methods for repairing surface cracks on a car's rear bumper: 1. Remove the bumper and identify the area that needs repair; 2. Use a plastic welding gun to heat and weld the backside of the crack; 3. Move along the crack while heating the plastic welding rod; 4. Once welded, allow it to cool to complete the repair. The front and rear ends of a car are equipped with bumpers, which not only serve a decorative function but, more importantly, act as safety devices to absorb and mitigate external impacts, protecting the vehicle body and ensuring the safety of passengers. The outer panel and cushioning material of the rear bumper are made of plastic, while the crossbeam is formed by stamping cold-rolled thin steel sheets, approximately 1.5 mm thick, into a U-shaped channel. The outer panel and cushioning material are attached to the crossbeam, which is then connected to the car frame's longitudinal beams with screws, allowing for easy removal when necessary.