Painting is the most widely-used finishing treatment, by which you can get glossy, matte, satin, or textured surface. There are two kinds of painting: coating spraying and powder spraying. The processes for plastic and metal prototypes are different.

Before the plastic prototypes are painted, the finishing technician first has to polish them. When it is sanded, it has to be polished smooth, make corners clear, and remove the obvious glue marks. The sanding must be done several times. After grinding the parts for the first time, the technician sprays a primer paint and then grinds again. After filling ashes and other processes, the painting is finished with the last time of grinding.

For sheet metal prototypes, after it is prefinished, the technician sprays the coating on the surface with a spray gun. Just waiting for the coating to dry out, and the painting work of the sheet metal prototype is done. The painting process of sheet metal prototypes is simpler than that of plastic ones.

Before painting aluminum prototypes, the technician needs to polish the surfaces. But don’t take polishing for granted. You must pay attention to precision requirements, and keep the smoothness and clear angles accordingly. The paint for aluminum prototypes is generally metal paint.

However, some materials are difficult to be painted, such as PP, Nylon, and POM. The painting is easy to fade. They are suitable to be high wear-resistant prototypes, mainly as gears and other parts for assembly, rather than appearance prototypes.

In this case, we will show you several CNC machined aluminum prototypes in gray satin painting.   

Aluminum prototypes with tapping

Other painted metal prototypes in aluminum for the same project