In my garage I have heating duct work running across the ceiling. "Glued"
to the duct work was once pink bat type insulation (now mostly black) and
it is now starting to slowly pull away. When I took a look to see how the
insulation was put on the ducts, I can see a black glue or tar was used. I
would like to replace all of the insulation with new but I'm not sure what
to use to adhere it to the duct work. Wrapping is not an option since most
of the duct has the top side flush with the ceiling.
What options do I have? What could I use to basically duplicate what is