The OPI 4-In-1 Nail Builder Gel is a versatile, vegan-friendly formulation designed for professional nail enhancement and repair. This builder gel requires UV curing to achieve a strong, durable overlay or extension. It is expertly formulated to provide structure, strength, and longevity to natural nails or artificial tips. Use it to sculpt, reinforce brittle nails, or create seamless extensions, offering excellent adhesion and a smooth application that minimizes filing.