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The shader used in this scene can be downloaded here.
Info

As well as the Layered shader you can also use the A video tutorial can also be found here.

Mix Shader

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Layer Standard Shaders

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mix_shader is used to layer two

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different standard_surface shaders. We will use

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one standard_surface shader for the top green paint layer (green) and

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another standard_surface shader to represent the exposed metallic surface underneath.

  • Create a 

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  • mix_shader and assign it to the object.
  • Create a 

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  • standard_surface shader and rename

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  • it 'Green Paint'.

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  • Create another

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  • standard_surface shader and rename it 'Metal'
  • Connect

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Note
You could also use the Mix or Layer shader instead of Mayas Layer shader
  • the Green Paint to Layer1 of the mix_shader and the Metal material to Layer2 of the mix_shader.

Curvature Shader

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  • Connect a noise shader to the radius of a curvature shader (bias and multiply will work too). Experiment with different noise settings to get the look that you want. Don't forget that you can connect a color_correct shader to the noise shader to further refine the appearance of the 'worn' look.
  • Connect the 

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  • curvature shader to the transparency attribute of the layered shader. This will control the blending between the two standard_surface shaders.

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cell_noise → curvature → mix_weight

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