Using the Car Paint Presets Pack:

In your scene,
Choose File > Append,
Locate the ‘CGL_Cycles_Car_Paint_Presets_Pack_1.0.blend’ file, and click it to browse its contents.
Click the ‘Material’ folder,
Double click the desired material preset,
Or select one or more wood material presets, and press ‘Append From Library’.

Select an object in your scene,
In the ‘Materials’ properties tab, add a new material, or select an existing one,
Click the material data block drop down button, and select a preset material you appended to the file.

* Note that the Metallic Flakes Scale parameter must be tweaked for the flakes size to fit your model's scale.

* Note that rendering metallic car-paint material presets with Denoising may soften and blur the metallic flakes effect.