If you can do it yourself, get some Emer-Clad. If the surface is prepaired right, it will be as good as the liner stuff. It is an industrial waterproofer. That website shows heaps of info about it. I have used it plenty of times on customers cars and I know of many panel shops tha use it also. Use a stone guard gun and thats what it will look like. Its clean up with water but resistant to water and chemicals when dry. It comes in many colours and can be painted over with 2 pack paints etc