This .Blend file includes:

A photoreal, PBR car paint material, made procedurally.

A material that can be changed on the fly, it can use up to 3 colors simultaneously. all of which can be any color of your choosing.

requirements:

no knowledge of shader nodes is required, it is a hands-free material that works out of the box.

ZERO UV unwrapping is necessary! it uses procedural methods

tips:

use the copy and paste tool, or the append tool, to transfer this material onto any other mesh in your scene.

If the shader has an odd scale, make sure to apply the scale of your object!