Here's the hard part. In your shadertree click on the top box that says MULTIPLE SHADER. Select COMPLEX SHADER --> MULTI CHANNEL MIXER Drag the WireframePro shader box down to the blender. Now you have two MULTI CHANNEL shaders that you can just drop complete shaders onto. I use an aluminum shader and a metalic paint shader.... OOPS! They are reversed so I check INVERT and I'm done.