Rust is a term used to describe corrosion of metals such as iron and steel. It is formed by the reaction of oxygen in the presence of water or moisture. If given time, any iron mass will eventually convert entirely to rust and disintegrate if exposed to oxygen and water. There are many ways to reduce the risk of rust formation on important items such as machinery, engineered components, automobiles and building structures which involve processes either by galvanizing, electroplating or painting. Galvanizing uses two processes called hot dip galvanizing and electroplating. Both are widely used today in industry because they are effective and relatively cheap to perform. The formation of rust can to a certain degree be controlled by painting to isolate the iron from the atmosphere, however many car producers today carry out a galvanizing process prior to painting bodywork. On the underside of the body a seal of usually a rubber or PVC based coating is sprayed on. Rust preventative compounds are now readily available on the market which can be applied to either the exterior of the car or inside enclosed sections such as the sills. These compounds are normally wax based and applied by pressure spray.