I just bought this and have been testing it out on my self (sanitarily) before I use it on clients. I previously have tried both the House of Lashes and Duo glue. Both are good, but I have had brides cry their lashes off with both even though they claimed to be waterproof. I was looking for a more cement-like glue. I think I have found it in this, but time will tell. Using it on myself, it did not budge. I worked out in my eyelashes and was outside in hot summer heat. I didn't cry though, which I feel is the true test of glue. When I went to remove the glue, it took a lot longer than previous glues to dissolve with makeup remover, and I found it more difficult to remove, which in my opinion is a good thing. Crossing my fingers for brides!