Take a look at the Fix My Kite Tear Aid Bladder Repair Patch (6"X3") at S2AS

Tear Aid Bladder Patches seal leaks and small cuts in bladders. 

Comes as a 6" x 3" Patch

Instructions:

1. Clean off area to be repaired with an alchohol swab.
2. Spread out bladder and remove all wrinkles
3. Place Patch over leak making sure to not allow and wrinkles