1. Choose the right sandpaper Before using sandpaper, first choose the right sandpaper. Different materials need to use different thickness of sandpaper, the general sandpaper thickness is marked as "#", the larger the value, the finer the sandpaper. For example, for the grinding of wood, you can choose sandpaper #80 to #180; For metal sanding, you can choose sandpaper #180 to #400. In addition, there are some special purpose sandpaper, such as polishing sandpaper and water abrasive sandpaper, can be selected according to specific needs.                                                      2. Clean the working surface Before starting to use sandpaper, clean the surface of the object to be polished. If there is oil or dust, it will affect the use of sandpaper, and even damage the sandpaper. You can wipe with detergent or a damp cloth to ensure that the surface is clean.                          3. Secure the sandpaper. Secure the selected sandpaper to the sanding tool. You can use a handheld sandpaper, sandpaper board, or sandpaper wheel. When fixing, pay attention to the flatness and tension of the sandpaper to avoid peeling, warping or loosening. The sandpaper can be fixed with glue or fixture to ensure that the sandpaper is strong and reliable.                                                                                                                             4. The grinding process should maintain the appropriate strength and Angle when grinding. Different materials have different ways of grinding. For flat materials, you can use horizontal or vertical back and forth friction; For curved materials, you can use friction along the direction of the curve. When grinding, it is necessary to apply even force to avoid uneven or excessive wear.                                                                                                               5. Pay attention to safety when using sandpaper to avoid hurting yourself or others. You can wear gloves, goggles and other protective equipment to avoid sandpaper debris or sanding spatter hurt. In addition, it is also necessary to pay attention to the service life of the sandpaper, replace the sandpaper in time, and avoid using excessive wear sandpaper.                                                                                                                                        6. Follow-up treatment After polishing, follow-up treatment is required. For wood, you can use a sander or manual sandpaper for fine grinding to make it more smooth and delicate; For metals, polishing, spraying and other treatments can be carried out to improve the surface brightness and anti-corrosion properties.                                                                                                                                                                                                            In summary, the use of sandpaper mainly includes choosing the right sandpaper, cleaning the working surface, fixing the sandpaper, sanding process, attention to safety and follow-up treatment. Mastering these methods can help us complete various grinding tasks and make the surface of the object more flat, smooth and beautiful. I hope that everyone can pay attention to safety when using sandpaper, reasonable use of sandpaper, to achieve the desired effect.

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