Originally Posted by brinky
Yes, the other side has started to lift but is not leaking...
You'll need a long patch preferably triangular in shape then, pointing forward, is probably going to be your best answer.
You should be able to glue the seam and overlay it with the patch, in truth its still going to be awkward to get it applied though due to its position, there are plenty of tube boffins on here should be able to assist if they see the thread, with a method.
Have you identified what the material is ?