You will not be physically able to sweat.
Warning: read the directions!
You put it on the night before, and usually one applications last 48-72 hours a day.
I used to use this stuff when I was 14-15 years old and nothing else worked.
I have made this recommendation to two people: 1 person was on the virge of getting surgery to fix his sweaty armipt problem, he now swears by the stuff.
The other got giant scabs under his armpits and curses the stuff, mind you he had red hair and opaque skin.