Quick question on my 70 SS ... I purchased a repro Rear Seat Shelf (which by the way didn't fit worth crap -- had to cut it). I got it to fit nicely now, but after a few weeks its starting to look warped. Was I suppose to glue it down? I have the insulation under the shelf... glue down the insulation to the metal shelf then glue the new seat shelf to that? Any particular glue if that's the case?

Thanks