Always works better than spit for me. I put maybe a pea-sized amount on each monitor and go. Never had any problems.
Perhaps reviewer above used too much. I've had very good results with this stuff. I put a small dab on each side.
I called up and asked a few questions about the product. It seemed worth a shot. It is useless. My monitor kept jumping and the strap wouldnt stay in place because the cream doesnt allow it to stick well enough. Water/sweat and what have you worked great before now with bpm. Maybe they will come up with something better once they realize this thing stuff is simply not worth it.