1. In the process of sandpaper grinding, it is divided into water grinding, oil grinding, wax grinding, dry film and toothpaste polishing, etc. The method of dry film is also divided into rough grinding, flat grinding and fine grinding. Coarse grinding is before Use the corresponding tools to clean all the dirt on it, and then slowly grind it, while the flat grinding is to wrap a small piece of wood and a gauze like hard rubber on the sand, and slowly grind a large area. This is very beneficial for levelling after grinding.
2. If a fine film is used, it is generally used in the construction of putty and sealer, including the method of fine film after color correction.
3. If it is a water mill, then you need to dip some water or soapy water on the sandpaper, and then slowly polish the surface. The advantage of water grinding is that it can reduce wear marks and improve the surface smoothness. And it saves a lot of sandpaper.
4. Sandpaper can be used in different places when sanding, and sanding is carried out in different ways. Generally, wood sandpaper is used for local putty sanding. The putty and primer layer that are fully scraped need to be sanded with No. 0 sandpaper. For sanding, part of the paint film can be dry sanded directly with sandpaper.
5. When sanding, be sure to see if the surface is flat. If the surface is not flat, then we can use sandpaper wrapped around small wooden blocks for sanding during the sanding process.
