@RachelMaraii, we have been discussing barrier patches for years here: Rash under Dexcom G6 sensor - #4 by Randy
And the YouTube video on how to do it was posted in 2018. So you might well ask why you didn’t find the info on the Dexcom site. The 3M hydrocolloidal bandage works fine for me. Tegaderm breathes, so it lets gas from the adhesive through.