i was about to make it myself, but i mixed up in the masking. I am trying to get multiple texture usage.
As always I wish to see an animation for the objects getting older... Firstly it is brand new, then it gets rusty! Would be so good!
Here is some helping tips for mixing materials in one object in the node editor.
http://wiki.blender.org/index.php/Doc:2.4/Tutorials/Materials/Nodes/Mixing_Materials
http://cg.tutsplus.com/tutorials/blender/3d_cg_vfx_blender_materials_mixing_texturing_rendering_node_editor/
