Ok it's great, it works but..... [SEP] I did the sample test on my husbands arm and after 24 hours, it was tough to come off. After scrubbing it literally turned into a rash over 5 days and had we waited the full 48 hours, we would've known it would be the same on his beard. There is a note that states the product could be irritating if left on the skin but how are we supposed to know if it'll work if we don't try it first. He likes the grey covered as it's not evenly spaced out naturally. However, the color does work, just follow the directions, but it irritated his skin. We've tried all kinds of products and they all are irritating except the natural products that are also available. In the end it does work, it's just not for us.