Hi, I am new to this site and indeed to the Acrylic Nail World! I have done quite a lot of pink and white sets of acrylic nails but very few backfills as most of my clients have wanted them as a "one off" rather than a permanent fixture. However, I recently backfilled a set of sculptured acrylic pink and whites that had been on for almost 3 weeks and were still intact with barely any lifting. I backfilled using a manual nail file (as I was not taught to use an e-file) by thinning down the entire nail and literally placing a new one over the top. After just 3 days one nail has come off and the others are lifting. I am wondering if this is due to excess filing but not sure how to get round it. Help please?!