Abrasive grit blasting, also known as sandblasting, is a surface treatment process whereby abrasive particles are fired through a nozzle using compressed air. Grit blasting is widely used in a variety of industries to clean or modify the surface properties of components prior to coating application.
Grit blasting is the most effective means of surface preparation, it is used to remove rust and scale in the fettling of castings, and for dressing of stampings and billets, etc. It is often used to prepare surfaces before welding (removal of scale, rust, or paint), and afterwards to improve the adhesion of coatings (e.g. paint, or galvanising).