i did everything except the roof - needed 4 pairs of hands for that.
i used a small piece of vinyl to test the surface - i gritted until there was a fine layer of dust from the plastic, probably 5 mins at most. i kept testing with the vinyl until it was sticky enough.
i figured if i gritted too much or if i destroyed it, it would be a cheapish replacement seeing as how its just a plastic cover (no idea of cost though). anyway it looks pretty mangled without the vinyl on.. you might be able to stick it on without sanding - test it out
would you happen to have a close up picture of the vinyl wrap for me please