When you first start using it, it can sting A LOT (even small amounts). I couldn't sleep with it on some nights. Dab your armpits with a slightly moist flannel (it shouldn't leave any moisture on your armpit though). It will still do the trick but sting less. After a couple of months or so the stinging will subside and eventually you won't even feel it at night 
	
		
			
		
		
	
				
			
	
 
 I just stick to dark coloured tshirts and pile on the deoderant. Some days are good, some are bad 
		