I used some stuff that was similiar but another brand. Mine was marketed as a plumbing repair tape. It was all silicone, it seems, but maybe a little sticky. It stretched well in 2 directions, and had a lot of give. It was easy to wrap irregular objects, and seemed like it would make a leakproof connection. Like I said, mine was a different brand, but I would not try to make a high pressure seal with it unless there were quite a few layers backing it up. Also, it had a backing for the adhesive that made it rather slow to apply. All in all, good stuff though.