I've been using it for years, but in the past couple years they must've changed something cause it doesn't work as well as it used to. I put it on splits on my fingers and within a day, the newskin has split!
Although this is probably bad for your health, I now just use clear nail polish, I only need one or two coats and it lasts (as long as I don't pick it). Takes the pain of a finger split away after the initial sting.