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This Bill Gates-backed startup fixes leaking ductwork with 'chewing gum' material: 'Most people should be able to save … $500 to $600 per home'
FYI: If you're not looking for a full-home resealing, you can try using mastic duct sealant — basically, a paintable sealant that will close leaks and holes — for a quick DIY way to plug one ...
For Construction Pros9y
Bergkamp MAXX Frictional Mastic Surface Treatment Applicators
which allow contractors and government agencies to apply premixed frictional mastic surface treatments and premixed slurry seal over highways, roads, parking lots and airport runways.