Juanone,
I wouldn't use a bra either. I kinda like that free unrestrained feeling without one. haha...
When I moved back from Atlanta to CA I installed the cover on my boat. I drove about a 1000 miles that way and I decided to pull it off for the dry weather. I noticed a scratch ring around the side of the boat where the cover fit the tightest. Luckily is was gelcoat, a bit tougher than paint, and I was able to buff it out. That was the first and last time I ever pulled with the cover on. I would suggest a clear "Protective Shield" which is sold by Griot's Garage it is made by 3M. You buy this in 2 to 4" wide strips and apply it to the front end,fenders, etc, to protect them from rocks and such. I am going to try it on my Cobra once I get it. the website is:
www.griotsgarage.com