Ok, I'm trying to make a rusted look and here's what I have so far. It's just rust spots with a mask and I used the Blender node to work it in to the original textures. I'm still unsure about it, and might only do 'new' textures if I can't get this to look better. I will keep trying tho, but I don't wanna waste too much time on it.

                                                                                                                    

Poser 10

Octane Render

Wings 3D