Is Flex Seal waterproof?

I'm curious about the waterproofing capabilities of Flex Seal. Have you had any experience with it, and if so, can you attest to its effectiveness in sealing out moisture and preventing leaks? It's important for me to know if this product is truly up to the task of protecting my surfaces from water damage. Could you please elaborate on your thoughts and any relevant experiences you may have had with Flex Seal?