Let your nail polish air dry for at least a minute. This will help the polish set and not run.
Fill a bowl with water. Drop in a few ice cubes to make the water ice cold.
Dip your nails into the icy water and leave them there for two to three minutes. Pat your fingers dry with a clean towel after removing them from the water. The cold water will harden your nail polish. The polish should be dry when you remove your nails from the cold water.