I bought this in the hopes that the nails would stay on for the 15-30 days advertised, but 9/10 fell off on the first day, and 2-3 have fallen off each day since reapplying them. The nails I have are not opaque, are the correct size, and I followed the instructions perfectly, curing each nail for 3-4 mins, but still they fall off as easily as conventional press on nail glue. I ensure I'm careful and not boisterous with my actions, but they still fall off. I will keep practicing and attempting to make this work because the ersa nails are so beautiful, but I'm really disappointed.