To be honest I probably misused the product but I want to warn others about it. I used it to try to sew up a new tin vent pipe from a wood stove that was emitting smoke. Although it seemed to do the trick at first and produced no smoke on the first or possibly second burn after use, shortly after I noticed a piece was coming off and upon checking I found that the material had run all the way down the seam come off and just lie down. over the seam. Of course, since it becomes inflexible after installation, it cannot be used in places where excessive expansion and contraction occurs, such as. B. in chimneys.