Ha..big, ole roll o' duct...musicians(and bedroom freaks
)best friend
.
I think if I was in a Man vs Wild scenario I'd want a roll a duct and some water and I'd be good to go!
I found quite effectively during hot humid outdoor gigs, that spraying down the BACK of the neck on the gittar with "Finger-Ease", helps tremendously to counter the condensation/sweat/sludge build-up even one set can incur.