Cleaning and roughening
Grit blasting, also known as sandblasting or abrasive blasting, is a process by which an abrasive media is propelled against a substrate using compressed air. When using a wheel blasting machine, the grit is not blasted by means of a compressor, but thrown by a wheel using centrifugal force. In both cases, the abrasive media hits the object at high velocity, thus cleaning the surface. The blasting process also roughens the surface, creating an excellent bond for any type of protective coating. For sensitive materials, a finer grain size is used.