Hi all i have a set of EP3 SI's that my friend painted black, (looks like shit)

Want to strip them and polish the rims. Tried paint stripper, It gets the black off and the silver paint off under neath but it wount touch the factory primer at all!!
I tried this paint stripping wheel thing that goes on a drill from wall mart, Works great on the black but cant touch the silver or primer without allot of force!!!
Does anyone know a way to make all of the paint come off???? dont want to scratch the wheels up to!! or i would just sand them.
Im getting frustrated with it!!