A quick walkthrough showing a way of using Topology Vertex Maps to get some nice worn edge effects. This just uses yellow/blue for clarity, ideally you'd have a sub material and a coat material, and use the vertex map to mask the top layer and reveal the bottom layer. Meshes need to be fairly dense (this one is ~70k polys). The great benefit is that you only need to make the materials once, and they can be used on other meshes in your scene, always staying true to the mesh's topology.
Topology Vertex Maps is a plugin from Paul Everett, CinemaPlugins.com:
cinemaplugins.com/c4d-plugins/topology-vertex-maps/
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