I am considering this for the top of my '63 Tbird..... I would imagine it is like any paint job but will ask...... Is there a life span for a metal flake paint once sprayed on? Does it fade with time? UV affect it? A lot of maintenance?etc. It's an expensive application and I'd like to know it was worth it. The car will get limited driving as our summers are short and spends winters in the garage.