The guy at my local ACE hardware today recommended I use " Rutland Hi Temp Stove & Gasket Cement" instead of the hi temp red RTV sealant on my pellet vent pipe. I'm having some issues with leaking joints on my 4 " Duravent pro piping and trying to get a good seal. This stuff is black and comes in a caulk tube. Has anyone used this? And would you recommend this over the RTV sealant?