I am a Sure Seal fan...it's not a tape but a waterproof/breathable membrane you put over your wafer. There is a learning curve to it but I think I have been using it for at least 5 years and wouldn't use anything else. (I even put a piece over my filter and the filter actually works!)
you can get samples at:
www.alpglobal.comIf your insurance doesn't cover the expense I recommend finding them (or any product they don't pay for) online at one of the cheaper medical supply stores that do not accept insurance...MUCH cheaper than getting them from my regular supply even when I pay for shipping!!!