Before having finilised textures, I wanted to play around and decide what infact I could make. I started with the main part of the Power box. I knew I wanted some rust on the model, so I started to look at images of rust.
The brush I used to dab the colour on was a custom one I created, by lowering opacity and also adding text into the brush. By picking the colour from the images above, I've created a rust look with quite a lot of ease.