With the paint products that are out there today if used the correct way they will last FOREVER. I have done a bunch of cars over the years and some where 10 to 12 years ago and they still look just as good today. And I'm not just talking about restored cars that only come out of there heated shops on nice days. I'm talking about every day cars that get parked outside every day! If you do all the work the right way and don't skimp on this or that than it will last forever. As foe restorations with out a dout it will last if the car only goes out on nice sunny days.