In this video by @nicashel, they share a creative use of Flex Seal Liquid to repair a torn rubber car mat. First, cut away any loose, damaged areas, then clean both sides of the mat and let them dry.
A 14-ounce can of the liquid is supposed ... dripped down. Flex Seal was flexible but tore when bent too far. And although it sealed the crack in our flowerpot, we had to use two coats of spray ...