I have always had very weak, peeling fragile nails and when I discovered Biogel Sculpture nails, I thought I had found the perfect solution! For nearly a year I went every 3-4 weeks and for the first time in my life, I had beautiful, strong nails that got lots of compliments. - until, I developed an allergy to something in the nail treatment, don't know what, but my own nails were separating from the nail bed! Had to stop going, back to using OPI Nail Envy, very unsuccessfully, and weak, very short nails!