I thought I knew the basics of tape, but as always I learned a lot from that video. The one that went through my head is mastic tape. I used some on actual duct

I thought I knew the basics of tape, but as always I learned a lot from that video. The one that went through my head is mastic tape. I used some on actual ducts and I don't know if it's just an extra thick layer of goo or if there are also more engineering secrets. But dang it is sticky and messy.