The Sally Hansen Double Duty Base & Top Coat acts as both a base coat to strengthen nails and a top coat to add shine and protect polish. Key Features: • Strengthens and protects nails. • Adds a shiny, long-lasting finish. • Dual-purpose formula as base and top coat. • Quick-drying and easy to apply. How to Use: Apply one coat as a base before nail polish and one coat as a top layer after polish application.