More than likely you have seen the Flex Seal ads on television. Flex Seal is water resistant, stands up to extreme heat and cold, been mention in the ad to seal leaks forever, and can be easily painted. The variety of choices are many. There is flex seal brite, flex seal clear and now the new thicker Flex Shot. The Flex Seal products can repair many things such as: gutter leakages, ceiling cracks, water heater leaks, ceiling leaks, window gaps, watercraft leaks, water pipe bursts from leaks, and many more.
There are many Flex Seal Reviews all over the internet. I read a review where a customer used it to seal foundation cracks and after they used it, water stopped leaking in. Other customers have mentioned how easy the product is to use.