Nail varnish has to be insoluble in water.why?

Nail varnish needs to be insoluble in water to ensure durability and longevity of the manicure. If nail varnish were soluble in water, it would easily wash off when exposed to water, leading to chipping and smudging. By being insoluble, the nail varnish forms a strong bond with the nails, providing a long-lasting finish. Additionally, the insolubility of nail varnish in water helps maintain the color and shine of the manicure over time.