Good morning
I have had issues with the sensor not remaining stuck on my arm or failing due to water ingress. I’m quite muscly and don’t have much arm fat, so my skin moves a lot since I’m quite active.
I’ve used multiple ways of applying the sensor, multiple off the shelf solutions for covers. After many experiments I developed my own solution.
I use an old sensor to draw a Circle on a piece of flexible sports tape 8x4cm to cut it in an oval with a sensor shaped hole. Then I wrap a band of kinesio tape around my arm.
You end up walking around
This allows me to take cold plunges and shower. It also enables me to surf, snorkel, crossfit etc for hours at once without a failing sensors.
All the best.