Flex Seal is a rubberized layer that you can use to seal leaks and cracks on your roof. Because it is simple to use and dries rapidly, it is a common choice for roof repair. But how long does it last on roofs? The answer relies on the type of flex seal you use. All varieties, although having similar overall features, come in a variety of forms with unique qualities, such as rubber or acrylic. For more details, read our blog post.