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Mar 18, 2021 at 17:43 comment added FreeMan I would suspect that the fiberglass cloth with also help to reinforce the very old concrete to ensure it doesn't flake off and fall on people.
Mar 18, 2021 at 17:09 vote accept Gherman
Mar 18, 2021 at 17:02 comment added Ed Beal Whatever is causing the bleeding this primer will stop that. The fiberglass mesh on a roll is to help hide imperfections in the concrete ceiling, that helps that you added that photo.
Mar 18, 2021 at 16:54 comment added Gherman This fiberglass doesn't seem to have coloring and I think it's not insulation. Maybe I used the wrong term?
Mar 18, 2021 at 15:16 history answered Ed Beal CC BY-SA 4.0