My phone's original paint job was mostly peeled off...bought it used. I wished I would have taken pictures prior to doing this. I honestly thought it was just going to completely remove all of the paint. Anything would have looked better than they way it looked. It came with a nice gel case and for me, as long as the screen was scratched free- its what mattered more...or so I thought. I also bought a new case. But after using alcohol, it worked out better for me. Now I am happy. No need for cases.
I only suggest this if your phone's OEM paintjob is peeling off- not the battery case- just the casing.