DaveFace: Yes your setup is what I meant. You are right - SSAO is also a major problem here. Matching the material color is also a pain in this case, but sometimes you may need a different color (like fresh chipped concrete, and not dents). All of this would be perfectly controllable through decal-like shader, because you’d also get a choice of what it affects (normal, roughness, color all alll of them).