Here are the paints I used to produce the rust effect. These are 
Modern Option paints, an iron basecoat and an oxidation solution.

Base colour dark grey spray paint.

The rust effects were made with a paintbrush rather than spraying. It required some practice to produce a truly authentic age damaged look.

First, the PSU...
...then the case
 
The inside of the case was aged all over.

I even rusted up the fans.
    
 
    
    
        
            
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