What I did a long time ago was epoxy 1" Carbon tape on the underside of the lip
all around the boat, since it was cracking and leaking.
(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
and the boat would mysteriously fill up with water.

Then with a D/A sander took off the gelcoat in front of the main beam and covered it with
5.7 oz carbon fibre mesh and paint.
Needless to say the boat and deck became incredibly stiff and very little toe in,
and obviously illegal for racing after this mod.