Hummm. That doesn't sound like Monstaliner's rep at all. I did the entire inside and out of my YJ. Not chipping or any issues what so ever.
I'm sure if you can get in contact with someone at Magnet they'll be glad to help you out
2010 JKU Automatic w/ 5.13 Gears
2.5" TeraFlex w/ Rancho XL9000s
17" XD Addicts
295/70/17 Nitto Trail Grapplers