I have built custom decks/storage bins using regular fiberglass as well as what they call "kitty hair".
Depending on your issue the kitty hair may work and its not all that bad to try yourself. Get some play around on pieces of wood or what not then carry over to the boat.
Plain ole fiberglass is a mother of a son of a dog. Basically in a nutshell you have a mat cut to fit over not exact, then mix your fiberglass (it will get hot and can burn you) then coat the mat. Once cured sand is with an armor suit on and shield over your face (I am exaggerating a little) due to the fibers once getting in your skin are like needles.
Fiberglass is stronger but I have used the mat with kitty hair for strength which worked.
You can probably do the hair option yourself as a nice little learning a new trade but you honestly couldn't pay me enough to do fiberglass for someone or myself again.
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