When I was cleaning my chimney a couple of weeks ago, I noticed that the piece of sheet metal that holds the liner in place (i.e., covers the masonry chimney) was loose. In other words, there was a sealant that appeared orange in color between the sheet metal cover and the top of the masonry chimney. Any ideas what this sealant was? Or what could I use to reseal the sheet metal back to the top of the masonry chimney?