Matthew Nall has been hugely helpful, from giving me guidance regarding which product was best suited to my needs to giving me pointers as to how to go about installing it.
The courier used (R&L) left something to be desired - having promised a call an hour before delivery they called 20 minutes before delivery and the driver was most unhappy at my desire to note damage to the exterior packaging on the delivery note, as your video indicated I should do (the actual product was undamaged). This isn't your failing but obviously damages the overall impression of the buying process.
It's possible I misread your site but it looked like the sealing tape came in 108" lengths so, having ordered 10 rolls of it, I was surprised to find it was actually 108' lengths and I now have enough tape to complete the job many times over. (This may have been entirely my fault.)
It's too early to know whether the product does what I hope as I haven't finished the installation.