SO SIMPLE Bonder solves those client issues with extra oily skin. Use this to prep the nail-bed for the application of gel. The SO SIMPLE Bonder uses moisture to cure, and works best if you allow it to sit on the nail before applying the gel. If the humidity is low, then the Bonder needs to sit on the nail a bit longer (30-45 seconds) before applying the gel. The cap must be kept on the bottle tightly to prevent moisture from getting into the bottle causing it to cure.