1.It is necessary to first look at the material of the workpiece and the degree of smoothness of the workpiece surface, so that the desired degree of polishing can be selected. For example, when sanding wood, leather and other fiber materials, it is difficult to achieve a very high mesh number, so when choosing the mesh number of waterproof sand paper , you can start directly from about 200 mesh, and 800 to 1000 mesh can end.
2.Grinding metal workpiece, you can start from 80 mesh water sandpaper, multiplied by 2 each time, to 1500 mesh when the grinding effect is already good. Higher mesh metal polishing, you can further use 3000, 5000 mesh water sandpaper, but the effect is little, at this time should use polishing paste, with clean cloth, paper, etc., dipped rub, or use wool wheel to deal with; There is also the use of chemical polish, the effect can reach the mirror, the only bad is not conducive to personal health.
3.Plastic, carbon fiber, glass fiber, stone products, the general original surface has a matte effect, water sandpaper selection is limited: 800 mesh, 1200 mesh, 1500 mesh, 2000 mesh, etc., higher mesh should use polishing paste.
