Thank you for sharing your feedback and we are sorry to hear our product did not work as you expected. Loctite Super Glue Liquid does adhere to clean and dry metal surfaces but may not have been suitable for your specific application depending on the weight of the numbers. If you would like to share the details of your application, feel free to reach us at 1-800-624-7767 so we can help you have a positive experience in the future.