Some roof panels are attatched with glue to the inner structure as well. My second gen Camaro is one which comes to mind. I have had two different friends say the same as GMracers friend, that they wouldn't do it again. One reason was that it didn't come out as clean as he'd hoped and cost a bunch to do it. But that's not to say you would have the same experience. I would ask a bunch of questions to the guy doing it and see what you think with more info. Good luck.