Woodburning stove pipes, including pellet stove pipes, are typically a series of shorter pipes fitted together to form a single pipe. Often, smoke will seep out of the pipe through joints in the pipe. To prevent this leaking smoke, you can use a high heat caulk.
Choosing the Right Caulk
Wood stove pipes get hot; therefore, high heat caulks must be used on them. Some single-wall pipes can get as hot as 2000 degrees F or higher. Temperatures of your stove pipe will determine the caulk you should use. Check caulk labels for temperatures each caulk product is rated to work with.