Have almost finished my 228. The hull I compounded using 7” and 3” dual action polishers. I used Gyeon Q2R Marine Polish Step 1 followed by Gyeon Q2R Marine Polish Step 2. If I did it again I would just use Step 1 the improvement with Step 2 was minimal with a light coloured hull. I wet sanded the gunnels, cabin etc. that were more badly oxidised. Oxidation will polish but not as well “fresh” gelcoat And you will get back the original Grady colour with wet sanding. I started with 800, then 1200, then 2000. Make sure you remove all sanding scratches left by the 800 grit with the 1200 or you will end up with a nice glossy gel coat but in the right light you see all these fine scratches. 2000 grit probably not needed as a heavy cut compound should remove scratches from 1200 grit. The gelcoat looks like new.
Hull stripes to go on then a ceramic coat.