Josip Kladaric writes:
Perfect Metal is a procedural Cycles smart material for painted metal. It supports the creation of many alloys and paint types. The initial version can simulate age and scratch damage and future versions will add support for dirt, rust, and pitting.
The goal was to create something that is easy to set up and fast to render. This material is 100% procedural and adapts to your model.
Free copy available for non-profit organizations, contact me.