I find those too heavy and bulky to use for delicate things like attaching corals, or light work in the tank, so I use disposable nitrile home care gloves, unpowdered, with a rubberband around my wrist to keep the water out. My arm gets wet, but I use a towel for that (and newspapers on the floor). They look something like this:
I get mine in a box of 50 at K-Mart, Walmart or at my local pharmacy. The nitrile material is much tougher than latex or vinyl, although those unpowdered types can be used too, but they tear easier.