EternabondIf there is a small leak/pin hole, the Eternabond will take care of the problem.
Clean the area well before applying.
There was a post a few days ago, on Ebay you can buy Eternabond by the foot. Just buy what you need to make your repair.
If you are not familiar with the product, do a forum search. There are lots of posts on the subject.
Eternabond is a great product.