There's a diffence in sanding a car out after fresh paint and wet sanding a couple of messed up panels.The majority of the stuff your talking about will come out just buffing the areas if the person knows what there doing.Wetsanding factory paint is a very tricky job for the simple fact of there's not much clear to work with.it can be done,I've done it a millon times,it all depends on the factory paint and like I said above,a person who knows what there doing.Factory clear is very easy to burn.