NAIR?!?!?!

What the freak , ok so nair is pretty cool with thin hair (tried it on my arm to make sure it worked) now I use the one that's made for your legs and it doesn't work!! Or idk maybe it's me , I have semi-thick hairs but not long nor much .. I leave it on for no more than 10 minutes as instructed and nothing , some parts are gone but majority of it is still there . Does anyone else have this problem??? If so is there anyway you got it to finally work for you?