The customs code, also known as the Harmonized System (HS) code, for eyelash glue can vary depending on the specific formulation and country of import/export. Eyelash glue is commonly classified under HS code 3506.91, which covers "prepared glues and other prepared adhesives." However, it's crucial to consult with customs authorities or a professional customs broker to obtain accurate and up-to-date information regarding the customs code for eyelash glue in your specific location.