Question number 2, I have had a horrendous experience with wheel spacers on a P car but managed to get them off with a tiny bit of damage to hat of rotor. But the problem is that they are frozen onto the hat of rotor after awhile with rust???. My last experience was with a M3 and I literally couldn't get them off. My wheel guy had to use a flat head screw driver with hammer technique. It was painful to watch this. He left huge gouges on the hat and I questioned whether my wheel would wobble. He ended up having to sand it down to get it as smooth as possible but I was kinda freaking out cause as I had track event coming up. It ended up being fine and several mechanic guys said it would be ok.
So what can I do to prevent this from happening again. Someone in the past said I should use some type of grease. Which kind?. Anything else I can do? Should I lightly sand the lip to get all rust off?
Here are some pics of the hat of rotor after it was sanded down so you can imagine what it looked before the sanding!.


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