What I did a long time ago was epoxy two layers of 1" Carbon tape on the underside (bottom side) of the lip all around the boat (NOT THE EDGE/glue seam), since it was cracking/spiderwebbing and leaking everywhere. (If you question the legality of this the 1989 Worlds TheMightyHobie18's where carbon reinforced.)

In addition, As I recall, I took old aluminum rudder pins and West System'ed them
under the lip at all four beam beam attachment points. (Aluminum is 10X fibreglass?)
At first I only did this at the main beam, but then the ream beam area cracked/split and the boat would again mysteriously fill up with water. (shear & tension between the lip and beam bolts area?)

Websites for carbon materials:

http://www.fibreglast.com/

http://www.acp-composites.com/