There is a lot of spraying rubber products out there, but Flex Seal is one of the best. You can use it to seal up any number of cracks, holes, or openings in any number of materials. It dries quickly to provide a water tight seal that will last. The commercials for this product are a bit over the top (although very entertaining), so I decided to try it out on my own in real world conditions. After poking some holes in a plastic container, I sprayed the container and tested it