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Registered
Join Date: Jun 2002
Location: Winnipeg, MB, Canada
Posts: 3,963
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This video says mastic seal is the best. I asked a tin basher (he installs ducts). He said mastic is old school. He uses the tape. Just make sure the outside is clean before putting it on.
Duct Seal Tips From TXU Energy & Energy Star | Duct Mastic & Foil Tape - YouTube
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Bunch of old cars 
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