Paint that you would use on a car is a safe bet for painting a case in my experience. (Engine paint, under coating, car grade gloss etc)
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Rustoleum Protective Enamel is great stuff. Very tough. Comes in lots of colors and finishes, and I think they even have a clear coat.
Just make sure you sand and clean the case very well. And use a self etching primer.
I coated an old case with pickup truck bedliner. Made a really cool texture.
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