How do you remove a urethane coating from a fiberglass boat?

To remove a urethane coating from a fiberglass boat, begin by sanding the surface with a medium-grit sandpaper to break the coating's bond. Next, use a chemical stripper specifically designed for urethane, applying it according to the manufacturer's instructions. After the coating has softened, scrape it off gently with a plastic scraper to avoid damaging the fiberglass beneath. Finally, wash the area thoroughly with water to remove any residue and allow it to dry before applying a new finish.