The Purner's I had were for the Gen II, and they looked similar to the ACR rim. Therefore, using a typical machine was not feasible since the holes were so small. I tried attaching a special small pad to a regular drill, but that took just as long and seemed even more difficult. Keep in mind, this is with the wheels OFF the car. Trying to polish them ON the car was nearly impossible, at least with the ACR type rim. To keep them looking really good, I would say once every 2 months was needed. Keep in mind, my car was/is a driver (about 500 miles per month). To jack the car and take off all 4 wheels, retorque properly etc..., figure an hour. Add another hour for each rim to do properly. Total time about 5 hours. I'm sure with the newer Purner design (dual five spokes) you could cut this time by an hour or so, but it's still a PITA if you ask me. Not trying to talk you out of Purner's, as John is a true Viper guy and his products are great.... But if I bought another set I would get them cleared (via spray or powder coated) or chromed. There is a reason the factory rims are cleared, and IMO they don't lose any shine and are sooooo much easier to care for....