Anything wet needs specularity, obviously. Additionally, anything wet is reflective. So, increase your reflection. Now when you start doing that, you start losing color in your mesh, so start increasing your Metalicity. This will bring your mesh color back. As you increase those two though (reflection, metalicity), your mesh will get "brighter", so start decreasing your Diffusion and Ambient, to get the mesh back to looking like it did before, except this time (hopefully) wet looking. (as in the asphalt) AgentSmith

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