Painting 101

[Xeanor]

For plastic (although I haven't done it yet) you don't really need to sand anything as far as I know, but if you do only do it very very lightly. I've seen 'plastic adhesion promoter' cans in the automotive section of the store I was, which is for painting plastic parts. (remember, a car is not only metal) and, as far as i know, if you use that before the paint, everything should turn out pretty ok.

The paint of my case is completely dried up now btw.... and it's so damn strong, I can't believe it. If this stuff comes off I'd be damn surprised.