I had a bra that I used on one of my cars for about seven years and I can't say I noticed any damage or ill effects from using the bra in that time. I would take it off every time I washed the vehicle and clean it as well as the car. I always kept the vehicle waxed (as I do all of my cars) and I would take it off a lot of the time when it would rain for days on end. It was extra work to keep everything clean and to prevent paint damage, but my opinion is with proper maintenance, you can use a bra with little to no paint damage. And you'll have a lot less dings on the front end too!
