I'm a bit late to the party here, I know, but I rarely check this part of the forum.
I had a bit of success in the fall and spring experimenting with liquid latex. It's a bit on the extreme side though, so I wouldn't recommend it to a lot of people, at least not for a full mask right away. I bought a quart of it and then "painted" it on my face and neck and even used it to paint and attach my ears. I would get my forehead, nose, cheeks, and neck fairly well, and then have to apply some black cake makeup to fill in the areas around my eyes, hair lines and mouth.
When I first tried it, I didn't use a liquid latex barrier spray, which I quickly learned was a huge mistake. LL sticks to itself, so if I leaned my head forward, the front of my neck would scrunch up, and when I straightend my head back up, the LL on my neck would tear, and by the end of my first weekend, it looked like someone has slashed my throat open. Once I bought some LL barrier spray, I got rid of the sticking problem fairly well. After that I found it stayed on extremely well even through immense sweating and even rain. Cleanup was also very nice as it's technically a latex mask, so grabbing the edge on my forehead and pulling down would remove everything and just leave me with makeup around the eyes, hairline, and mouth to cleanup with a baby wipe or two.
There are a couple of pretty big negatives though. The first is that LL comes off like a bandaid. This means if it gets in any of your hair, that hair is coming out with it. This is especially tricky if you have eyebrows, a goatee, or use the LL to hold your ears on. LL also shrinks a little tiny bit as it dries, so it kind of feels like your face is being squeezed a little tiny bit all day long. The last negative is that it does not breath at all. You will still sweat, but it will all happen under the LL, so if you wear it for too long or on really hot days, your face will just feel nasty and potentially break out with acne.
~Joe