With the eight inches of rain we received in two days back at Christmas time, we became aware that the ~23 year old house had a leaking roof vent.
So we took a clear afternoon and got out the ladder, some roof vent goopy-goop, latex gloves and proceeded to smear each vent with a layer of sealer.
We’re hoping the sealer does the job and when we wind up replacing the roof (original to the house) we’ll replace all the vents outright.
It's called Panther Poop.