This is a product I used to know as bi-seal tape and is an excellent product for the toolbox or emergency repairs. Not cheap but great for insulating wiring as it provides a very professional finish.

Regards,

Phil

Hi Phil,
I have been using self amalgamating polyisobutylene tape for many years now (it would have to be one of the great inventions). Only downside is it does not stick to the substrate only to itself.
Regards,
K-BIKE