Rustproofing in Metabo usually deals with making any metal resistant to corrosion due to climatic changes. This is usually done to protect the surface of metal such as iron or steel from rusting. Rustproofing is mostly done for automobiles but one of the main things related to this process is that they need to be renewed from time to time. Most automobiles at rustproofed part-wise before the first coat of primer is applied to them. There are also some companies who sell aftermarket rustproofing kits that are then used for rustproofing both external and internal surfaces, if the consumer so wishes.