Flex Seal spray will work on some caulks and not on others. Additionally, the Flex Seal spray will not adhere to Flex Shot, but it will cover it.
We recommend using Flex Shot for any projects that require caulking because it is long lasting and durable.
Flex Shot will last up to 30 years and will not fade, dry, crack, yellow or deteriorate. You won't need any other caulking products because Flex Shot has you covered!