I've used this product for a few years both indoors and outside and it has stood the test of time. Most recently I dismantled an outdoor circuit that was covered with this tape. By the time I got it all cut away, I was cursing. That's how well it stood up. I now use no other tape for electrical work. Be careful, 3M makes different grades of electric tape and not all of them are as good as the Super 33+.