| Clavus, you hit the nail square on the head.  The paints can be a pain in the butt to adhere to plastics, or metals for that matter.  I painted a keyboard a very deep metalic blue, it was beautiful, until i picked it up.  It was like a lotto scratch card.  It broke my heart.
 Theres a couple of things I have figured out to get around this.
 
 1.  Base coat with a rattle can Kreon, or other purpose made primer.
 2.  Sand down, just to add a slight rough surface to let the paint adhere too
 3.  Paint in fine, multiple layers.  This is a really hard step, because you just have to be patient.
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