The claim. Flex Seal "stops leaks fast and is the easy way to coat, seal and protect almost anything," the manufacturer says. In a promo video, pitchman Phil Swift applies Flex Seal to a screen ...

Flex Seal is available in clear, white, gray, and black. If you want to stain your fence a different color, you can do that as a separate coat and then apply clear Flex Seal over the top. Preparation ...