Various surface adjustment methods will be explained hereafter.
First, the blasting methods. Blasting methods employ abrasive mediums sprayed or projected onto surfaces either by Dry method which is in the air or Wet method which uses liquids containing the abrasive materials. Both methods yield non-directional polished surfaces.
The abrasive materials used for the process are sand shots (silica sand, alumina sand, etc.), grit (pulverized steel, etc.), powdered iron (reduced iron powder), cut wire (cut steel wire), and high hardness steel shots.

An example of a dry blasting system is shown in [Fig.1].

An object is placed in the process chamber and the abrasive is sprayed on the surface while keeping the gun tip at proper distance from the object. The spent abrasive material is sent to the cyclone and reusable portion is recycled. The removed powdered material is trapped by the bag filter. As shown, the process chamber is a sealed steel box and the gun is typically fixed stationary. There is a glass window and a pair of rubber gloves on the front side, and the operator holds the work piece with the gloves and apply the process using the foot valve.
There are dry methods where compressed air is utilized to spray the abrasives as well as methods that project the abrasives with blade type devices similar to windmills. This method is used for objects too large to fit inside the process chamber.
The wet methods are typically used for less aggressive removal needs. Surfactants, rust inhibitors, cleaning chemicals, and polishing materials are mixed into water with suspended alumina powder, silica sand and etc. Compressed air is used to spray.