This may be old hat to some of you but I thought it may be useful to some of the modelers on this forum.
This is a technique for improving kit rally wheels. I am using a wheel from the Revell 71 GTX to demonstrate my method.
You want to begin by sanding the backside of the wheel with some fairly coarse sandpaper to speed the process. Here I am using the coarsest grit that comes in the Testors sanding film packs.
Sand until you begin to see the holes in the wheel from the rear and keep sanding until you can pop the center out of the trim ring. Be careful to keep the wheel flat on the sandpaper so that you don't sand more off of one side.
Now you can paint the center without worrying about getting paint on the trim ring.
Now glue the center to the wheel back being sure that it's centered.
This also gives you a realistic gap between the center and the inner edge of the trim ring as well as making the wheel slightly deeper looking.
.
If you don't need the Mopar wheels you can use the trim rings on something else(if they will fit of course). If you need a shallower trim ring just sand the back down some more.
I hope this is useful to some of you.
gus