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!