Quote Originally Posted by zmcgovern45 View Post
My wife's mazda averaged about 3 mils (75 microns)

You should be just fine with a solid 2 step correction (compound and polish)... just know that it is the care after correction that matters just as much. If the car needs to be compounded every year due to heavy wash induced swirls then that may be an issue... if proper care is taken, and only a light polish is needed every year or two then you will be just fine.
+1