Sandblasting is a process in which metal is prepared for anti-corrosion treatment, i.e. painting. By pressure-blasting the metal, fine grains of sand remove rust and other contaminants.

Zinc coating (hot-dip or electrogalvanising) is a chemical process in which a layer of zinc is applied to the metal to protect it against corrosion

Powder coating is the application of electrified powder paint particles on a conductive (metal) surface. Electrostatic forces keep the powder layer on the surface of the painted element. Next, the elements are heat-treated in a furnace where the powder coating dissolves, resulting in a surface evenly covered with paint.