How can I add a texture to a specific face? I have a cylinder (imported from Creo, in .obj), to which I've added a material, steel and rendered it. It looks great.

I've now cut it in half, and want to see a different texture on the cut face, how do I do that in Cycles?

I tried diffent tutorials from that site but doesn't work with Cycles and imported .obj.

Here is an outside view:



Then, when cut, the blueish part should show the cutting tool path leaving marks in the metal.



Marks or scratches could be like this.
Okay, I think I found a way (since unwrapping doesn't seem to work for me).


Select the part, go to edit mode, do a Ctrl+Tab and choose Face
Then select the face of the part I want to add texture to (there's a bunch of little triangles that need to be selected)
Next, assign a new material to that face, and deal with texture in Nodes.