I'm also a fan of Opsite Flexfix, but I generally don't use until the 2nd week that I'm on the sensor. At that time, the edges of the tape holding down the sensor start to come up. Flexfix holds the sensor down for an additional week.
Skin Tac Wipe by Torbort group is a great product. I contacted the manufacturer and they instructed me how to use it with Dexcom sensors. Instead of applying it to the skin, where it could interfere with the sensor, they suggested that I apply it to the sticky side of the sensor tape, once the paper backing was removed. Then, I would wait about 30 seconds before applying the sensor to my skin. The portion of the sensor that penetrates the skin never comes in contact with the Skin Tac.
I've also found, that placing the sensor on my shoulder, where the skin is smooth, stops the edges from coming up. There are several videos online on how people do this. I don't have the dexterity to do it myself, so my wife helps. The arm also happens to be less painful.
I'm pretty active and I sweat a lot. You sho