I decided to buy a role of Self Bonding Super Tape to keep in my toolbox specifically for waterproofing coaxial connections. This is the exact same thing as splicing tape which you will find at any hardware store, so I’m not sure why harbor freight calls it super tape. Anyway…..
I will now be using it any time I put an RF connector on or have a coax connection out of doors. It’s much waterproof than electrical tape because it stretches out and bonds to itself very tightly. It doesn’t break the bank either. A 10ft roll costs about as much as a good roll of electrical tape, and it doesn’t take much. With electrical tape I end up wrapping over and over and sometimes still don’t get it watertight. I used about 3.5 inches of splicing tape in the picture below.
This stuff is not sticky like you would think. In fact, it isn’t sticky at all. You have to stretch it way out to get it to stick to your connector, but once it sticks you just keep wrapping and it’s a breeze. I have not tried taking any off yet, but it seems like it would be easier than the standard tar.