Sandblasting consists of bombarding the surface of a material with one of many types of sand, grit or shot. Normally sandblasting is carried out to remove paint, rust or scale, but it is also used to impart a particular surface, or uniform finish, to the object being blasted. It can also be used to remove imperfections e.g. machine lines.
Linishing is a type of finishing technique used to smooth or flatten metal objects. This process is similar to sanding, but differs in key ways, including how it influences the appearance of the metal. Linishing is not only used to smooth and polish an item, but also to improve overall flatness and create a level, even surface. This process can be used to finish objects ranging from tools to building materials, and plays a major role in automotive finishing and repair.
Polishing can remove machine marks from parts and reduce roughness on the parts.