There is hardly ever any reason to cut a hole in the deck of any cat for this type of repair. Repairs, if done correctly, can most of the time be done from the outside. Cutting holes in the deck will weaken the structure and cause it to delam much more quickly. And...make another place for water to get in.

Remember, Hobies are a foam core sandwich, with the bread being the fiberglass skin. Carefully grind into the outer skin damage to get to the foam and assess the inner skin damage. Repair the inner skin if it's damaged, lay in a new piece of foam, glass outer skin, and gelcoat. Pretty easy with a little knowledge.

There are several problems with using epoxy when repairing Hobies. One is that gelcoat doesn't always cure properly over epoxy. It's always better to use what the boat was made out of for the repair. Epoxy is way more pricey, and unless bonding, the strength is not needed on an old 14. Save your dough for something else.