Disclaimer: The owner of Rescue Tape is my buddy, and I made that silly video for him (originally designed as an end-cap display video for Ace Hardware Stores).
I've personally used it at home and on the boat and it works every time. And while it's great for whipping the ends of lines and can be effective as an anti-chafe mechanism, it's kind of "permanent" if applied for this purpose (meaning you can't easily slide it up and down a line or remove it for use on a different line).
However, we're almost six-months into a test of Spiroll Rope Protectors. Here's the web site:
Spiroll Rope Protectors - Marine Definitely watch the video on that page and you'll totally understand why it's so good.
So far we think it's an awesome product for the intended use. Not only has it eliminated chafe on our dock lines, it has also eliminated those annoying "squeaking" sounds dock lines make as they rub on the boat. We're going to make a product demo video about it in a few weeks.
So... Rescue Tape will work and be effective as an anti-chafe for your dock lines. But don't tell Ron I said the Spiroll product is faster and easier to use for this purpose.