A: Thank you for the question. The answer is yes, it does expire. The Loctite Quick Set Gel Epoxy has a 24-month shelf life unopened. Once opened the shelf life no longer applies. The Lot code is printed on the syringe label and should begin with the letters “LB” followed a number and letter which represent the year and month manufactured. For example: LB9FAC569 would read 9F where 9=2019 and F is 6th letter in alphabet = June. That means the products was made in June 2019. If you need assistance is deciphering the lot code, please reach out to our Technical Team at 1-800-624-7767 so we can help you.