1. First remove the small burr from the bumper wound, smooth it with sandpaper, clean up the dirt on the bumper wound, and then apply automotive ointment to make the whole body smooth.

2. Secondly, mix the hardener and other articles used for bumper repair evenly, and apply it to the wound with a scraper.

Finally, wait for about four hours. After the ointment is completely hardened, polish it with water sandpaper.