Thank you for your feedback. The tile should be cleaned with rubbing alcohol before applying the L-shaped strip. Often, there is grout residue left on the tile that makes it impossible for the adhesive to stick properly. A thin bead of clear, waterproof, 100% silicone caulk applied to the inside of the strip will also keep it in place nicely. When the shower door is installed properly, with the 5/8" space under the door, the strips are very effective in preventing water from escaping from the shower. All of the strips included have been engineered to work with the Unidoor and have been in use on tens of thousands of installations, without issue. If you would like to, we invite you to contact our DreamLine Customer Support Team at 866-731-2244 to discuss this further. We can also be reached by sending an email to support@dreamline.com. Our hours of operation are 8am-7pm EST, Monday through Friday and Saturday from 9am-5pm EST. Thank you for your purchase and for your feedback. We are sure your Unidoor is a beautiful addition to you bath.