Small Boat Floor How Can I Patch A Small Crack In The Bottom Of A Fiberglass Boat?

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

I have a boat with two small fishing village of fiberglass, that man has some cracks on the ground and a disturbing number of water comes through the floor because of it. All repair instructions that I read to be patched for cutting a hole in my boat. Is there another way to seal cracks? Can I apoxy surfboard or fiberglass?