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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