People who know carbon fiber will understand that water grinding is one of the key process to determine the quality of finished products. Dry grinding and wet grinding are both popular in the carbon products industry. At present, our workshop is water grinding workshop. The first grinding is 300 grains of sand, then 500 grains of sand, finally 1500, After the three times grinding, the surface is smooth, and the split line has no white dots, then they will be ready to wait for painting.