The benefits of CNC parts include substantial flexibility in material choice, high accuracy and repeatability.
Typically thicknesses of 50 to 300 micron can be applied that not only seal the substrate, but also significantly stiffen the geometry allowing it to survive far more arduous conditions than before.
The process was originally used by Formula One race teams to achieve desired stiffness when testing geometries in a wind tunnel. However because it also substantially improved 'survivability', it was later used on fitments to the cars themselves.
Most materials can be coated, however the benefit is maximised when used to coat materials such as Nanotool or glass filled nylon (GFN).
It is now available for cosmetic applications and offers some exciting possibilities both in the Rapid Prototyping and Rapid Manufacturing arenas.