I noticed last night a little smell, and I am out of Rutland High Heat silicone, so I ran to the automotive store and got some permatex orange high heat. I am just riding it out till I can pull this pipe. My stove adapter now looks like vinnys, until he redid his with Icc Excell pipe. Is that stuff pretty tough, I have a month and a half to go before I shut the stove down. I have used this stuff on valve cover gaskets, but never a pellet stove.