Over the summer I spent some of my free time developing the car paint shader which I plan on using in Cafe Races. Initially, it started out as a simple idea, but it quickly evolved into a massive project. It grew in complexity and the graphic qualities also grew. Now I have a system which can simulate hundreds of different types of car paints, and if you are a UE4 developer, I want to share it with you! The tutorial is being hosted here at CafeRaces.com you can find the specific page here: tutorial
If you give it a shot, I wish you luck. The effort is certainly worth it!