How safe is Flex Seal?

I'm curious about the safety of Flex Seal. Can you tell me more about it? Are there any potential risks or hazards associated with using this product? What kind of precautions should I take when handling Flex Seal? Is it SAFE for both indoor and outdoor use? Additionally, how does Flex Seal compare to other similar products in terms of safety and effectiveness? I'd appreciate any information you can provide to help me make an informed decision about whether or not to use Flex Seal.