Customer Service: A Skin Test before use is necessary. Stop using immediately once feeling uncomfortable! Please feel free to contact us if you meet any problems. We are more than happy to help you out. Healthy& Eco-friendly& No-lifting: The nail primer and nail dehydrator were made of healthy ingredients. MODELONES hard gel builder features healthy and 11 toxin-free ingredients. No harsh ingredients or adhesives that lead to damaged nails, paraben & cruelty-free, anti-chipping, low odor and skin-friendly. Builder nail gel Requires drying under Lamp. 30 Days+ No-peel & Bubble Free: Modelones builder nail gel is made of professional formula. Say Goodbye to Air-bubble and Peel-off problems. High durability gel builder with nail bond primer and nail prep dehydrate can last longer and bring you natural, strong, flexible, and feather-light nails. Long-lasting for 30+ days with proper application. Upgraded 8-in-ONE Builder Nail Gel: Designed with innovative formula, this versatile gel builder is perfect for 8 amazing applications including as a base coat, color gel, building apex, strengthening overlay, extending length, shaping nail, and attaching false nail tips/ gems/ jewels. (NOTE: It is normal for builder nail gel to remain a little sticky after curing, which will make a better adhesion between nails and gel layers. It is recommended to use top coat to seal it). The Basis and Must-have of Nail Art: To create a foundation, using this duo set to prepare the nail plate is the most crucial step in any professional manicure! The NAIL PREP DEHYDRATOR can clean the nail surface and help to bond the natural nails and mani products. The NAIL PRIMER can enhance the stickiness of the nail surface, and help the mani products not lift and be long-lasting for more than 30 days.