VRT looks nice on the vinyl bed covers but it will run down the bed sides when it rains. I have tried all sorts of different ways to apply it and not have it run down the side of the truck but it always does, even after numerous wipe downs to remove excess. It looks nice but just be aware.
The Backflip. Wash it like any other part of the vehicle, seal it with HGG, maintain with detail spray. If you apply VRT to the backflip it will have nothing to soak in to.