Rob Allen torpedo dive float is leaking

[Odo]

I have a bladderless Rob Allen torpedo dive float that rapidly leaks along all the stitching. They now have bladders. I contacted Rob Allen and asked what the material was (PVC fabric) and asked if fix-a-flat or Green Slime can be used to seal the leaking stitches. I was told that some people have had success using those type of products. Has anyone had any luck sealing the stitching and if so what product did you use? I contacted Green Slime and they gave me a great response that was very useful, but no guarantees.