Material - Painted Metal with Rust under Paint

For this material I needed to create a painted metal that could age between a cleaner version to a rusted/chipped version. The idea was to capture how rust under the paint will bubble and chip it and eventually expose the bare metal. A level node controls the amount of rust and another one the age of the metal. There is also a switches which can toggle between clean painted metal, bare metal, or rusted/chipped painted metal.