I have a 25' bay boat with a black hull. It had medium oxidation in the places with the highest exposure to the sun, and lesser amounts in more protected areas. I watched the Shurhold videos, and decided I could do this myself instead of paying someone $700. I bought the DAP, Buff Magic, wool pads, polish and polishing pads. It was work, no doubt, and the worst areas required 3 treatments. The results are impressive. The boat looks fantastic. I will probably address a few areas again later this year, but this product actually works. One piece of advice, it the speed of the machine makes a big difference. Slower seems to be better, especially of the oxidation is heavier. This is mentioned in the video, but I can attest through trial and error that slow speeds and taking your time will produce astounding results.