Well, i've embarked on a repair using aquaseal & dowels to fix this - the dowels are used as in a cabinet face frame joinery fashion, difficult because there isn't much thickness to deal with, but it seemed to work. Aquaseal is a product used to glue rubber type stuff - wetsuits etc. I use it to fix kite bladders( kitesurfing) & it works well. It will be interesting to see if & how long it works for, will report back!
Bill Conquest