Center Console Boats And More

How can I patch a small crack in the bottom of a fiberglass boat?

I have this little two-man fiberglass fishing boat that has a few cracks in the bottom and a worrisome amount of water comes through the floor because of it. All the repair instructions I've read include cutting a hole out of my boat to patch it. Is there any other way to patch the cracks? Can I use surfboard apoxy or fiberglass?