Use a chemical stripper like "Tough to Strip" available at most hardware stores. Get the bottom nice and wet with water, so the paint is wet through, and apply the stripper with a throw away brush, as thick as you can get it to stay on. Wait 4-6 hours, scrape with a sharp scraper. That will take off a lot of it. If there is still a substantial amount of paint remaining, repeat the process. Do this until you are down to mostly gelcoat. Then clean THOROUGHLY with fresh water, scrubbing with soap, let dry, sand the gelcoat and remaining paint to prep for the new stuff, and apply your new paint. Best option for removing lots of old layers of paint. Stripper works better when its warmer. Easier than sanding it all off.
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