I've seen some bondo jobs that you couldn't tell without a magnet. As far as no bondo on the bottom, I've seen rusted out rockers filled from both sides and look good and solid and not have enough metal in them to make a tin can. I've even seen rusted frames bondoed and then painted over, only to show up 6 months later when the frame broke. There's people out there that'll do anything to make a buck. :mad:
