To spray with fast moving solid grains (such as sand propelled by compressed air, although softer material like sodium bicarbonate used for delicate materials may also be so referred to). The process is used for stripping dirt, rust, paint etc. from the surface of objects
A system of cutting or abrading a surface such as concrete by a stream of sand ejected from a nozzle at high speed; compressed air is used to propel a stream of wet or dry sand onto the surface; often used for cleanup of horizontal construction joints or for exposure of aggregate in architectural concrete; a method of scarifying the surface of concrete or masonry to provide a bondable surface; used to clean metal before painting