Originally Posted by 42x16
A powder coater will strip off the previous finish before putting the new powder coat on the frame so it doesn't really matter what you have on there now.
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My point was that powder cant be applied over paint, the old needs to be removed which is an added cost.
Many powder coaters wont have the facilities to remove paint in a manner that is friendly for bike frames.
Some may sand blast old paint off which isnt what you want done to your nice and thin tube set.
Some will bake it off or even use a tiger torch to burn off paint both of which will also run havok with your tubeset.
Some will have a lousy chemical removal process and bits will remain, which then bubble up and cause problems with the finish.
Just be aware that if you want a great job done on an expensive frame, research who's doing it and be sure they have done bike frames previous. Many powder coaters do industrial work and not much bike frame experiance.