Yeah I'd hit it with 600. Incidentally, I'm running into the exact same problem on my roof! I can scratch it, too. It's hard to see what I'm doing up there when I'm doing it, so I must have just put it on way too thick there. I'm going to start wetsanding now.. the roof is going to take me awhile..

:|

I'm not sure about those wheels, I know they are 15 inch but that's all I know. Maybe 15x7, don't know the backspacing, they were on the car when I got it. the front wheels are 14". I'm going to put a big bolt setup on the back and probably put those wheels up front and run some black steelies until I can minitub it, then I'll get some centerlines of the proper offset to run some meat back there.