Also, it's not flexible, so if the repair is too big, the flat tape around a curved bladder will buckle and you'll end up with little tape furrows that bleed air. Even if you stick the tape on a perfectly flattened bladder, once it expands the furrows can form.
My exact problem.
Funny that you mention leaks from installing the bladder, I assisted caveman in putting a brand new OB in his 13m and it immediately leaked. Upon removal it had many random pinholes.
I suppose i will just find a new bladder for this kite.
Had the exact same problem multiple times so stopped using them as I was not getting anywhere. The good thing is that this forced me to improve my repair skills to the point where there is now almost no bladder beyond repair