If the bumper is severely damaged, it is recommended to replace it directly. If the bumper is only cracked, the repair method is as follows: 1. First, open the hood and remove the bumper. 2. Align the crack on the bumper and secure it with transparent tape to prevent deformation of the crack edges during operation. 3. Plug in the prepared soldering iron and flip the bumper over to inspect the crack inside. Wait for the soldering iron to heat up, then use it to melt and fix the crack inside the bumper. Operate according to the direction of the crack. 4. Use a plastic welding gun (hot air gun) to weld along the crack with the prepared PP welding rod. 5. Remove the transparent tape used on the bumper crack and go over the crack with the soldering iron again. Then, use 400-grit coarse sandpaper to sand the areas treated with the soldering iron and those needing touch-up paint. After sanding smooth, apply putty and let it dry. 6. Use wet sandpaper, starting with coarse grit and then fine grit to achieve a smooth finish. Rinse clean, wipe dry with a clean cloth, and wait for it to dry completely before painting. 7. Before spraying, shake the spray paint evenly. Maintain a distance of about 20 cm from the surface to be sprayed. Do not spray directly to avoid uneven coverage. Maintain an angle and allow about 15 minutes between each spray, applying 5-6 coats in total. 8. Let it dry for a few hours, then reinstall the bumper front panel. This completes the crack repair.
