Get a sock. Put the open end over the business end of a talcum powder jug and get a good amount in the sock. Tie a knot in the end of the sock and put the sock in a ziplock baggie. When my palms get sticky/clammy, I simply squeeze the sock and replace it in the bag. It's worked very well for me.
"Besides, this criticism of Segovia is pointless. If you disagree with what Segovia did, take that energy and go out and do something positive. Otherwise, shut up." - Eliot Fisk