Why do the edges of nail polish curl up after a while after applying it?

There are several main reasons for the edge curling:
The nail surface is not thoroughly cleaned. If there is grease, sweat or dust on the nail, it is difficult for the nail polish to adhere firmly, and it will naturally curl up over time. It is recommended to wipe the nails with a special cleaning liquid or alcohol before applying to ensure that they are clean and oil-free.
Apply too thick or without wrapping. Applying nail polish too thickly, especially without wrapping the edges, can easily cause shrinkage and curling. Wrapping means brushing the nail polish to the edges and sides of the nails to lock the nail polish.
Insufficient lighting time. Insufficient curing time and incomplete hardening of the nail polish can also cause curling. Adjust the lighting time according to the power of the lamp to ensure that each layer is illuminated through.
Life habits or external forces. Contact with hot water and detergent when washing dishes or doing housework, or frequently scraping things with fingers, may cause the edges of nail polish to curl up.