Not sure, but I think I may have a seperation in my Liner. It is a Flex Liner in a Clay Tile Masonary Chimney. When I did a sweep in the Fall, and noticed about half way down the brush would loosen up, then tighten back up about 2 feet later, and the same on the way back up.....I didn't think it was possible, and haven't had a chance to shine a light down there since it was now clouded with Ash. The question(s).......does it sound like a seperation ???.....and what kind of problems can I expect if I continue burning without repairing the seperation ???......