Obviously this isn't a Porsche but same process. This car was an absolute mess. I sanded off the clearcoat painted it with Duplicolor since it was black it was available off the self at AutoZone. Black is probably the easiest color to do but I've done bumpers in Guards red with the same results. I painted the whole car a panel at a time. It's been 3 years and the worse thing that I had to was buff a couple places. Must use 2K clear.