Thanks for your advice. I'm going to order some right now!Tegaderm. I won't wear a sensor without. It usually stays on for the whole two weeks, although with the warm weather and lots of swimming I've needed to clip the edges and put a new patch over.
I use a 10 meter roll of 10cm width, and cut pieces of about 8 cm to cover. A bit smaller would work as well, but I like the extra.
Yes, same with the tegadermA top tip is to round the corners, it helps stop it lifting.