2. First, polish the scraped burr with coarse sandpaper, and then polish it with fine sandpaper until it is smooth. Sandpaper must be polished with water. )

3. Choose 800C coarse sandpaper and 2000C fine sandpaper. Use coarse sandpaper to polish first, and then use fine sandpaper to polish.

4. Polishing is easy to dry with a dry towel or paper towel.

5. Fill the pit with soil and cooperate with the scraper.

6. According to the size of the pit, squeeze out a proper amount of soil to fill the pit for the scraper.

7. Fill the rear bumper pit and polish the burr first.

8. Fill the soil after grinding, cleaning and drying.