Flex Seal adheres best to clean, dry surfaces. Use a stiff brush or a vacuum to remove dirt, dust, old peeling caulk, and loose paint. If the area is greasy, wipe it down with a bit of rubbing alcohol and let it dry completely. 2. Masking the Area
This is a thick liquid you can brush or roll on. It is best used for the exterior windowsill or the surrounding trim if the wood is starting to rot or crack. It creates a seamless protective "shell" over the surface. 3. Flex Seal Spray flex seal on windows
Flex Seal products are designed to create a flexible, rubberized barrier that expands and contracts with temperature changes. This makes them useful for: Flex Seal adheres best to clean, dry surfaces
Have you tried Flex Seal on a window? Let us know in the comments below (or warn us about your mistakes)! It creates a seamless protective "shell" over the surface
This guide covers when to use Flex Seal on windows, which products to choose, and how to apply them for a professional, watertight finish. When to Use Flex Seal on Windows
Because Flex Seal (especially the spray and liquid) is difficult to remove once it cures, use painter's tape to protect the glass and the surrounding trim. This ensures you only get the sealant where it belongs. 3. Applying the Sealant