I've been having some troubles with my fires lately and it dawned on my that the troubles started when I gave my chimney/stove pipe. I used the SootEater to clean out the pipe from the bottom up. Anywho...I didn't have any incense sticks but I lit a match and the flame almost got blown out buy the suction through the stove pipe seams. Obviously, I need to seal them up. Does anyone make a flexible silicone based sealant that will survive very high temps? I know Rutland has a silicone version that will survive up to 600 degrees but I don't think that will survive near the stove collar. I have double wall chimney/stove pipe and the 600F silicone would probably be fine except for the first few feet off the stove. There is also Rutland's Hi-Temp Stove and Gasket Cement. I'm sure it would do a good job sealing but how does it doesn't appear to be flexible once cured. How does it hold up to vibrations and the natural expansion/contraction of the metal pipe? The stove pipe does get banged around a bit when the SootEater is going through there. Any suggestions?