When you use the fill tool to change a particular elements colour, it can sometimes fill out all the AA edges too. Looks like that's what happened to some of those decals.
@Chilifan:
The easiest way to fix this is to shrink the part a little, then enlarge it again. 5% or so should be enough to take the roughness of the edges. Or if you can afford the fuzzyness, just blur them. Just FYI
Wow! A lot of cool skins here, im not a pro skinner but i made a few and this one is well, the most simple... but also the one with most positive comments so i decided to post it. (the lights are made from a Volvo 240)
1) This has nothing to do with skins
2) Are you mad for other users or what? Posting 2048x2048 image
(from amazingly slow hosting as well) is not sensible illepall