What will Flex Seal not stick to?

Flex Seal Spray adheres to most surfaces, but there are a few exceptions. It won’t stick well to surfaces that are extremely greasy, oily, or dirty, or to nonporous materials like certain types of silicone, polypropylene, or polyethylene plastics. For best results, make sure your surface is clean, dry, and free of any loose particles before spraying. When in doubt, test a small area first to check adhesion. 

For more information on Flex Seal Spray, click here.