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If you are referring to the damage in the second to last photo on your personal page, I would profer the damage was done by the boat being against a high float or piling.

While the photo does not show close detail, from a distance it appears the gel coat has been smashed off and there is exposed fiberglass. Given this is above the water line, I doubt much damage has been done other than above.

The repair technique is straightforward, building back the fiberglass and then applying gelcoat.

If a previous owner sealed the damage with caulk it helped seal the fiberglass to prevent water intrusion. This is a good idea for the short term.

While not a purist, I strongly discourage everyone from using an adhesive (3M 4200 or 5200) as a filler. If you want a temporary repair so you can use the boat and not be worried, apply a good marine caulk (i.e. Boatlife) to seal the damage and keep water out.