It's not often you find a car paint shader made by someone who paints real cars for a living, but, that's exactly what I'm selling you here.
This is a shader geared for getting a good paint onto your car model within a single minute, yet, with extensive fine-tuning options. Also, there are 18 correctly labeled presets to quickly import to your own project and easily edit (some shown in the screenshots above).
It can achieve gloss, matte, metallic, pearlescent and iridescent paints by just using the available sliders.
It's made with procedural materials, and, like real metallic paints, the paint from this shader is composed of tiny colored flakes visible in macro close-ups.
There is detailed documentation describing what each slider does.