But the paint needs wax...
You can't wax through the film. That is my point. Proper paint care involves cleaning, polishing if neccessary, foreign matter removal, waxing and touch ups on chips.
The bra concept is merely an easy way out, clear or not.
And if it is on the leading edge of the hood, it will be impacted by brush, mud, and limbs if you wheel in wooded areas, just as if it was on the sides of the vehicle.
I don't like any type of car-bra. It is not a proper solution to the problem. The solution is time, work, and a little cash regularly. The prevention is actually keeping the proper distance between you and the vehicle in front of you.
After almost 75000 miles on this Discovery, and a cross country trip to California and back, and many, many, interstate miles on I95, as well as it's share of off roading, I have only two real areas where my paint is scratched.
The first is from a hidden barb wire fence, the second is from a wild animal. I have no stone chips at all, and no scratches that won't buff out. The one time I decided to "go with the flow" I won a nice windshield divot. That says something about following at a safe distance.
Cheers,
Kennith