Yeah be careful - my old man was "slightly taped" on the rear bumber by another guy a while ago. Both cars looked like nothing had happened so they shook hands and just aprted ways, nothing more. Over the next few days the bumber actually pulled itself back - seems like the supports had bent but the plastic was stiff enough to push back so that it looked fine but over a few days the plastic slowly creeped into a buckled state. Not much but would of probably meant a new bumper, supports, etc = $2000 for a pro to do it. I got out the heat gun and hammer, bashed the supports straight and reworked the bumper - didn't look mint but good enough that you wouldn't notice.