So lemme tell you something, folks. This is what the ceiling of the Vendor's Hall/Artist Alley looked like at Aki-con this past weekend. Now, the people running the con would have you believe that those big stripes of gray/black all over the ceiling is tar to seal the cracks in the cement. And yes, that is roofing tar smeared all over those cracks. This is a 3400x5100px image of said shitty tarring job.
What I can see here is water damage so severe that it's caused the paint to fall off the ceiling entirely, in great big chunks that make it look like someone's taken to the ceiling with a hammer. Those big spots of water damage were then tarred over (multiple times, it seems, since there's evidence of an earlier tarring job that's been painted over). Never mind the buckets (the five gallon bucket is a hilarious, if not terrifying in its implications, addition) that are SCREWED into the ceiling to catch the drips coming from those uselessly-tarred cracks. All of the cracks are leaking black ooze, and there are also hairline cracks in the paint and cement so big and long you'd think they were in the fabric of the universe itself, streaming black ooze.