Nail polish thinner is a chemical solvent, which has the tendency to restore and maintain nail polish. It is basically used to maintain the thickness of the nail enamel.

Those nail polishes which are too thick and are difficult to apply are made thin by mixing with the thinner. The thinner liquefies the nail polish and helps in reducing its thickness. Regular nail polish thinners also inhibit the property of certain fast-drying nail polishes. They are also used to stretch out the amount of polish you can get from a bottle.