For different conditions of the scratch surface of the paint, the materials used are different, and the polishing machine needs to apply force when removing the scratches. Pour the poshing agent onto the surface of the paint or surface of the grinding disc and adjust the speed of the polishing machine to 1500-2000 rpm. The polishing agent used in the polishing process can remove the vortex traces left by the paint surface during the grinding process, and can eliminate the sanding marks left by the 2000 sandpaper effortlessly. This process requires the use of a grinding disc, suitable for hand operation or machine. Using with mirror finish can have a very bring surface