i guess the idea is to make sure everything is rock solid to start with, then with the wrap on, it would act like a shield against the elements. kinda like laminating a sheet of paper, the paper doesnt degrade once laminated.
by the way im not a vinyl saleman or anything.....
i have looked into doing this and the only reason im not going to, is that the paint job is poor to start with. the way i see it, i may as well do a full respray and know the job is good. if i can raise the money and the missus signs off on it then i will remove the engine/gearbox, bodykit, interior and strip the paint to the metal. send the car to the bodyshop with the remit that it has to be the best job they ever did, then refit all, and drive away knowing its as best as it can be. i would never be happy wrapping it knowing that ****e awaited me once its removed.