My first thought was whether Nomex, a synthetic polymeric material, might leave smears of material in the bore. I knew that if Nomex did melt, the melting temperature would be pretty darn high but just how high? So, I went to the DuPont website on Nomex to see what they said about the melting point of Nomex. This is what they had to say about that "NOMEX® products do not melt." So, with that concern taken care of, I am now of the mind that if you can find some of the correct thickness, it sure is worth a try. Heck no it isn't HC but, like others have said, it just might solve the problem of dangerous smolderning patches. Like a famous homemaking expert likes to say "..and that's a good thing."
Give it a try and let us know what you find. :thumbsup: