@MISkier I started with 600 grit sandpaper ad a rubber sanding block. Keep a bucket of water handy and do 2' square sections at a time. Don't skimp om a good buffer, they are a not a lot of money and you will have it the rest of your life. I bought a Makitia 9237c with a 3 pack of buffing pads (heavy light and medium) for less than 200$ on Amazon. After wet sanding start with 3M Super Duty Rubbing compound, then 3M Marine Compound and finishing Material, and lastly 3M Color/Gloss Restorer. For wax everyone has a favorite, I like 3M Marine Ultra Performance Paste Wax. After I finished I could see my reflection in the gelcoat. If you want any tips or have questions PM me. Happy to help!