This going to be a 3 part solution. You can find all the materials you need a a Boat Supply Store or online. For the first step you will need all purpose filler such as FORMULA 27 ALL PURPOSE FILLER. It comes with hardener, Make sure the area you are working in is well ventilated. Follow the directions and fill inn your hole making sure to not allow it to stick out. Next you will need a Fiberglass repair kit. A kit is the best way to go since it will include everything you need. Again, good ventilation and follow the mixing instructions. You will need sandpaper, medium, fine and super fine (600 grit). If you build iu up to much you can and will need to sand it down. It will not be perfect but you can feather it into the existing area around the hole. Once this cures (hardens) you will be ready to go. The last step is cosmetic, gel coat, this is the shiny surface with the color in it. This step is up to you. It is not needed and can be difficult to match the color.
Good Luck
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