Has anyone else used black insulated pipe? I got it at menards because I was on a budget, and it sucks ! I am very new to stove ownership and went up to clean the pipe(It's 6-8 weeks old) and the cheesy screws that are suppose to keep it together were not doing their job. There was black gunk(creosote?) running down the outside. The install is this 6" pipe inside of an existing 8"chimney. Is this install a bad idea or is the pipe junk and should I return it before 90 days are up. I have 4 insulated sections 2' each and 2 unisulated 2'. It's not though anything except a 3' box on a vaulted ceiling- no attic there. Should I use the more expensive stainless. I have really enjoyed burning and cutting wood (just bought a new ms390). The stove is an Englander 13nc bought it on clearance at lowes at the end of this season. It's going now, since it may snow again this week!