Tear Aid Bladder patches are the BEST MATERIAL to seal leaks and small cuts in bladders. The patch can be cut into many smaller patches as well if pinholes are the problem, and TearAid will stick to any bladder with a really solid and usually instant bond.  

1 Patch (6" x 3") = $3.50

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