Permatex 82112 1" x 10' Self-Fusing Silicone Tape

I use this to seal up hoses with tiny cracks or wire sheathing that's worn out in the engine bay when it's not enough to replace the entire wire/hose but enough to want to do something about. It works great, it seals great, and it's strong. Just make sure you pull it VERY tightly when wrapping it around - like, tighter than you think. This "activates" when it's stretched, so if you're just loosely wrapping it around like a piece of tape you're not going to get the full effect. Pull it tight. Like, for real, tight. Really tight. Have I emphasized "tight" enough yet?

I used it to fix my wife's apple computer power supply and it performs amazingly!

Needed to protect a number of electrical connections, on boat, from saltwater, sun light and rubbing. Electrical tape did not hold up well and lasted barely a week. After a year, the Permatex connections still look great. A few tips for using: 1) easiest to apply in warmer whether, 2) needs to be stretched while wrapping and 3) keep area clean of dirt. Once tape has adhered to itself, cannot be unwrapped.

A+

It says fuel resistant, but I used it to wrap some pump wiring in my gas tank and after a month it was translucent and falling apart. Will probably work for a short while as a patch job but not for submersion. Otherwise it seems to be working well in open air applications.