The rubber base gel used in nail polish gel products is typically a type of gel polish that serves as a base coat. It is specifically formulated with rubber-like properties to provide flexibility and durability to the nails. The rubber base gel helps to protect the natural nails and create a strong foundation for the application of color gel or other nail art designs.

Rubber base gel is designed to adhere well to the natural nail plate, providing a smooth and even surface for the application of gel polish. It also helps to prevent chipping, peeling, and lifting of the gel polish, extending the wear time of the manicure.

Overall, rubber base gel is a key component in nail polish gel systems, offering enhanced flexibility and strength to the nails while promoting long-lasting and durable manicures.