I always use the Skin Tac wipes before after using the alcohol wipe that comes with the Libre sensor. A couple of years back when I started using the Libre, the first 3 sensors all fell off after a maximum of 4 days - very annoying!. I found that after a particularly tough session at the gym, so involving perspiration & a shower, that the adhesion of the sensor was compromised. So when Abbott then advised the Skin Tac wipes, I was keen to give it a go to see if it improved the situation with the final of the last 4 initial sensors I had purchased. It worked perfectly & was stuck firmly on my arm for 2 weeks.
Very envious of those of you who have found no need for additional adhesion to keep the sensor attached, but equally please to have found a solution to make the Libre work for me.