Mrtony5 -
I agree that the rock can do damage, but I think that because you are "orthogonal to the debris", you should be ok. When I had metallic tape on my wheels, the tape was *very* fragile but ended up lasting a long time :
Then one day at the car wash, the dude that was drying the car poked some holes in them :
I don't blame the dude because I failed to warn him to be careful. Lasting for 8 months is more than I would have predicted.
CarloSW2