Here's why:
* The formula has changed: The separation indicates that the ingredients have started to break down, which can affect the consistency and performance of the polish.
* Uneven application: The separated polish might not apply evenly, resulting in streaks or patches.
* Dull finish: The polish may not dry as smoothly or produce the desired shine.
* Shortened lifespan: The separated polish may chip or fade more quickly.
* Potential for bacteria: The separation can provide a breeding ground for bacteria, especially if the polish has been opened for a long time.
What to do instead:
* Try to mix it: You can try shaking or rolling the bottle vigorously to try and mix the separated ingredients. However, this may not always be successful.
* Buy new polish: If the separation persists, it's best to invest in a new bottle of nail polish.
* Use a clear top coat: If the polish has only minor separation, you can try using a clear top coat to help smooth out the application and improve the shine.
Remember, it's better to err on the side of caution and replace separated nail polish to ensure a smooth and long-lasting manicure.