Back when I was younger and didn't mind hanging onto a buffer for 6 to 8 hrs, this was the best way. Now depending on the quality of the finish on the boat and your talent level and tools, you can wet sand with a DA sander and make pretty quick work of it. I've made some real turds look very nice before. It's not possible for every boat, but it is possible to do. But It's not easy. Lots of sanding, buffing, polishing and waxing. Good times.