My wife's '99 Chrysler 300M has the chrome plated aluminum 17" wheels and has a slow leak around the bead on one wheel. When I broke it down, I found some of the chrome plating was gone and the alum had started to oxidize leaving a rough place where the tire should seal. I wire brushed the area, applied orange RTV to the wheel and re-inflated the tire. DIDN'T WORK. Any suggestions?<br /><br />Thanks, John