Servo RP B being a rust preventive oil, is bitumen based. To facilitate application, this oil is diluted mostly with volatile solvents. Prior to the application on components of metallic nature, the solvent evaporates and is known to leave a thick and hard film that sticks very firmly to the surface. The oil is a provider of long-term outdoor protection for all kinds of metallic surfaces. Owing to which, it protects wires, industrial plant structures, steel rods, tubes, assemblies, water tanks and castings. The oil is often known as an RP oil which is of the water displacement kind. It is vastly put to use in the engineering industries for the protection of all the ferrous components from rusting. It can very easily also be applied on other metals.