Pete, you may want to bring your boat by that shop Jack mentioned above and ask them what they recommend, they could tell you exactly what and how to do it...correctly, might save you some time and effort, maybe get a price for them to do it for you too.

I have a good friend who does a lot of fiberglass work on airplanes, that's who I take my boards and hulls to whenever I put dings in them. He does great work but I do have to pay him. If you want me to I'll ask him about a price to re-gelcoat your hulls.