the more the merrier...as many as you would like becuz it realy depends on ur up keep and if u used harsh cleaner waxes and a buffer, when u was and claen ur car becuz that will slowly take off paint in time then if u have to wetsand spots that takes some also..just apply more coats on the bends. i would cut in harder spots then one light coat let it tack up then two good wet coats...or if u have access to a paint booth with heat lamps bake between a few coats wetsand and repaint..just to keep the orange peel affect down ...and if u have any ..any imprefections in the base coat it just gets magnified in the final stage...CLEANLINESS AND PREP IS GOLDEN..oh just becuz the factory HZ yellow and REd are single stage doesn't mean u have to buy it ,but if u buy a dual stage, clear is a whole different ball game. it can be ur best friend or worst enemy..