Bring old, thick  back to life with Zoya Renew Nail Polish Rejuvenator. Specifically designed to work with nail polish that is toluene, formaldehyde and DBP free. Add one drop of Zoya Renew Nail Polish Rejuvenator to your old nail polish bottle. After closing bottle, roll it gently in in your hands for 30 seconds and let Zoya Renew Nail Polish Rejuvenator do it's magic.