I just use the spray on liquid chalk by Progrip and find it helps a LOT. I didn't use it for years, instead i just rubbed my hands on my pants prior to the buzzer going off. This may be a little OCD, but I've found that using D-Wipes to clean off your hands every few stages and then applying the grip enhancer works very well. You end up with some chalk on your gun/clothes/gear/car/etc., but our hobby isnt a clean one anyway so no worries there.
TBH i don't love the manual pump dispenser, and wouldn't buy it again in that type, but overall its a very useful product.