Old Sunfish Sailboat Diagram I Need To Repair The Bottom Of My Sunfish Sailboat. Any Ideas?

I need to repair the bottom of my Sunfish Sailboat. Any Ideas? - old sunfish sailboat diagram

I have a sunfish that many small spider cracks in it. it is a little old and needs a repair on the underside. I wonder what is the best way to solve this problem? I go into the fiberglass and resin? Or something more