I live 2.5 miles up a dirt/gravel steep mountain road that means after 50ft I am driving through clouds of dust and stones being thrown up. I have protective film on at the exposed stone hitting points, my +8 is Connaught Green. When everything is covered in dust you can't see any lines, etc, when freshly clean you can't see anything either. When I polish it does leave a line on the edges which I use a tooth pick to clear away. Certainly protects the paint work and driver cleans up pretty well too.
