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Kenik,
Some caveats about rolling fender lips.
My position has been it's difficult if not impossible to "unroll" a fender lip short of replacing the panel (or the lip) or by extensive massaging of the fender edge.
It's also impossible to replace material once trimmed (ground, cut) off a lip, but in that respect, trimming specific areas is more accurate and provides a better-looking transition to the remaining fender lip. And in the front, only selected areas of the fender radius require massaging for needed tire clearance.
In addition, if maximum clearance is achieved by rolling, the resultant edge will be a hem where the metal lip folds back onto itself. If existing paint is a consideration, no paint coating will survive at this extreme edge angle.
In the area of corrosion protection, a rolled lip must be somehow sealed from the elements. Otherwise, the narrow, U-shaped edge will allow dirt and moisture to accumulate, and the more acute the bend, the more likely contaminants will be trapped. When rolling a fender, there's always the likelihood of the body paint cracking. It can happen on the other side of the panel too. A cut edge, like the factory lip, is less likely to trap road debris and moisture, and a sealer can be easily applied to coat the exposed, trimmed edge
Sherwood
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