We’ve all seen the infomercials. A screen door on a boat, a leaky bucket, or a cracked gutter—and in seconds, that trusty blue (or black, or clear) can of Flex Seal saves the day.
Sealing the glass panes, the sliding tracks, weatherstripping, or window AC units. flex seal on windows
Unless you buy the clear version (which still dries with a slight haze), Flex seal leaves a thick, bumpy, textured finish. It looks like truck bed liner. It will destroy the aesthetic of your historic wood windows or modern vinyl frames. We’ve all seen the infomercials
Flex Seal is sticky and rubbery. If you spray it on the window tracks, the sill, or the weatherstripping that allows the window to slide up and down, your window will glue shut. You will not be able to open it for ventilation or emergency egress. Unless you buy the clear version (which still
The short answer is: Yes, but only in very specific scenarios. Here is everything you need to know before you spray. Flex Seal is a rubberized coating. It is excellent at filling micro-cracks and sealing surface-level moisture . Here are two situations where using Flex Seal makes sense:
When in doubt, grab a caulk gun. Your windows—and your home’s resale value—will thank you. Have you tried Flex Seal on a window? Let us know in the comments below (or warn us about your mistakes)!