Coating on duct boots?

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  #1  
Old 06-09-20, 09:36 PM
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Coating on duct boots?

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Hello there. I am curious why my duct boots look like this in my new home: https://imgur.com/a/fXiiSVZ

What is the purpose of this black coating?
 
  #2  
Old 06-10-20, 04:57 AM
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Probably so that you dont see the shiny duct through the floor register grille.
 
 

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