One of the wheels on my 98 Mark (basic model)has chipped chrome on the inside of the rim where the tire meets the rim. I had the rim ground down on both of the insides and had the tire sealed with the gook. I still get a very slow leak and have to put air in about evvery 10 to 14 days. The wheels are called the "octoline" or something like that. Its the standard 1998 Mark 8 wheel. Any ideas on how to fix this problem without having to spend hundreds on a new wheel? I haven't tried any junkyards yet but there is not a whole lot of them around. Any help greatly appreciated.