We've all seen the magnets that people put on their vehicles which say "Support our Troops". People have asked me if I would put one of these on my car and I said no. Not to be disrespectful to our troops, but I'm worried about pontential paint damage. Am I correct? I thought water would never really escape behind the magnet and cause the paint to peel or maybe blister? There would always be moisture behind the magnet sort of speak.