Builder Gel Tutorial. Part 1: Nail Prep. This process takes a while and it takes practice. Do not get discouraged! Put on a good tv show, podcast, or audio book, and don’t rush it. Filing your nails seems like a simple task, but it can be one of the more difficult techniques to master. It was for me. -File carefully to avoid accidentally filing your natural nail. Don’t file in the same spot for too long because it will cause friction and heat. -Don’t touch anything with the hand you are working on. I’m serious. Oils transfer SO easily and will cause your gel to lift. If you have any questions, ask away! 💞