Why is cling film used during an eyelash perm?

Cling film is used during an eyelash perm to create a barrier that helps retain heat and moisture, enhancing the effectiveness of the perming solution. It prevents the solution from drying out too quickly, allowing for better penetration into the hair shaft. Additionally, the cling film keeps the lashes in place, ensuring a more uniform curl and reducing the risk of the lashes sticking together.