I am sure alot of you already know how to thin your clumped nail polish by adding a little remover to the bottle but here is an alternative method. Take a mug of hot water (not boiling) and put your nail polish in the water. Let the polish sit about 5 to 10 min(depending on thickness)& then remove. Shake your nail polish & allow it to cool. Once cooled shake again and apply! Your polish will be smooth again!