Can it b used on a basement cement wall?

Hey there! Many people have had success using Flex Seal Liquid for applications like this. We always recommend testing the product in a small area before completing a project. Check out this link for more information: https://flexsealproducts.com/blogs/how-to/flex-seal-liquid-for-basement-waterproofing If you have any other questions or need project-specific help, send us an email at humans@flexsealproducts.com or a DM on socials. We're here to help!