My biggest issue with G2BG is the hold. It holds decently for an average day, but there is often lifting (at least with lace) toward the end of the day. If you sweat in it (for me) it loosens a lot, then dries pretty securely again. I live a pretty active lifestyle and my friends are the type that might one second want to go rock climbing and the other second go hot tubbing. I wouldn't trust G2BG for either.... but I sure wish I could!
With skin my big concern is bubbles/waves. I haven't tried it so don't know, but if it isn't molded perfectly to your skin and can't be stretchy/manipulated like lace, won't it just have giant bubbles in it or big waves you can't secure down?