1.Enhance the adhesion of the coating.Generally will make grinding on the dry old paint film
before spray a new paint film.Therefore,it will occur the phenomenon of too smooth surface
and poor adhesion.
2.Base material.For the base material,mainly to clear the burr,oil dirt on the surface of the
substrate.
3.Blowing over the surface of the putty.Generally the surface is rough,need to get a flat surface
through grinding.So the grinding can reduce the roughness of the workpiece surface.
It is not a redundant work for grinding the prototype model.It can clear the impurities effectively.
In addition, If some material have done the shaved putty, the surface is rough ,it will be getting
smooth after grinding.Besides,after grinding,the coating can adhesive better.