Notpolish New Nail Prep Acid-free Primer The Reason for Applying Dehydrator and Primer: Nail Prep Dehydrator & Nail Primer plays an important role in any professional artificial nail application( applying the gel, gel polish and acrylic nail). After applying this set, you can get these effects: 1. Acid-free, no burn and no harm to nails. 2. Anti-off prevention. 3. No lifting.