Have you tried a clay bar on your gel coat yet? I have no idea what condition your gel coat is in, but I would suggest trying a clay bar if your just trying to restore the shine. They come with a spray lubricant, and remove all the crud that builds up on a boats surface. Follow up with a good polish, and then wax. Worked wonders on my Vette, will be trying soon on my boat. Does a great job on a finish in OK shape to start with. My kit was made by Meguiars.