How do I prevent slipping on my yoga mat when my palms get sweaty?

When I do "downward facing dog" my palms get clamy & sometimes sweaty. It's hard to relax into the pose when my palms start to slip. I've tried using my partner's mat & get the same problem whereas he does not. I've asked yoga teachers & the only thing they seem to suggest is putting my sticky mat out in the sun or giving it another scrub. But, the mat is adequately sticky otherwise. I've tried sprinkling a little talc powder on my palms & that helps a little temporarily.

I wonder if a mat made out of a different, perhaps natural material would work. I saw some on healthandyoga.com made from woven grass or cotton yarn. The yarn mat claims to absorb sweat & the grass looks like it might have better tracton when my palms get sweaty. It doesn't look like it would get slick when moist unlike the standard latex sticky mats.

Does anyone have experience with other types of mats or have any advice for me? Any exp. w/ natural rubber mats?

Put baby powder on corn starch on your palms before class

You're making me horney.
Yoga gloves!
http://www.yogagripgloves.com/products/y...
Don't use a mat, this is just a gimmick. Think about it, yoga has been around for over a thousand years, they didn't always have sticky mats so why do we need them now? Use a firm blanket or woven carpet. If you are on a slick floor use the sticky carpet backing, it works better than putting your sticky mat under the blanket. If you are on carpet you probably don't need anything.

Also check your poses. Don't push into the dog so much, go more down and less out.
This is what yoga master Rodney Yee suggests.
Are you doing power yoga? I don't sweat as much with hatha yoga. Try bringing a small towel with you. That helps me. All the yoga mats are made of pretty much the same mat'l so I don't think changing yoga mats will help much. Hope it helps.