I put mine on definitely at night at the bottom of my foot and rotate feet and during the day if i am home on the palms of my hands and rotate.
only use slightly in the beginning for an hour or 2 then as much as possible. from what i understand.
your talking about a zapper, correct??
I tried it on other places on my skin but got some nasty marks.....they say that is from being too acidic my ph is only 6.75 but that is from 5 so i'm going up :) so i get marks and therefore, keep it at the bottom of my feet or palms of my hands.