Plug Weld Floor Pans?

Glue is glue period , I work at a reputable chrysler dealership with a body shop , they use glue where the oem s did and add e few stich welds for assurance , I borrowed the glue gun to re bond some reinforcements inside my hood (followed the body guys instructions sanded and cleaned both surfaces thouroughly three times) and the hood wasn t even back on the car and the bond failed!
Yeah the stuff comes loose, I've refixed quite a few. One where the trunk floor was done and instead of absorbing the crash energy the panel sheared loose and was poking through the back seat, and a Honda where the qtr was loose under the backlight and qtr window, rockers, and wheel house, no collision, from just riding around. Both situations involved multiple insurance investigators. In a DRP situation Ins. Co's really frown on the stuff.