What is the primary reason for using a bonder in the eyelash extension process?

The primary reason for using a bonder in the eyelash extension process is to improve the adhesion and longevity of the lashes. A bonder is a special adhesive that is utilized to strengthen the bond between the natural lashes and the eyelash extensions. This chemical helps to create a more robust connection, ensuring that the extensions remain securely attached for a longer period of time, thus enhancing their durability.

In addition, the use of a bonder can help reduce the chances of premature loss of extensions due to environmental factors or everyday activities. It effectively aids the adhesive in curing quickly so that the extensions can withstand factors such as moisture, temperature changes, and other elements that might weaken the bond over time.

The other options, while they may pertain to aspects of eyelash extensions, do not accurately capture the main function of a bonder in this context. For instance, enhancing the color of the lashes or making them waterproof are not primary functions, and reducing the weight of the extensions does not relate to the role of a bonder in improving adhesion.