The box stores have masonry sealants as well.

I don’t know how they flash but I would guess just a beveled line of good sealant, not painters caulk.  

And yes, tell the tenants to run the ventilation fan during a shower, and recaulk using a good thick bead of 100% silicone sealant...but sadly, I think the problem is that the greenboard behind the tile is rotting out.

If the stucco terminates above grade, there is generally a sealant used cover up the foundation from the bottom of the stucco to grade (mostly for aesthetic purposes).

"They covered the poop with some sort of sealant."

If you make prudent use of acoustic sealant and/or hang a second layer of 1/2" drywall over the fire rated - with a liquid acoustic membrane (i.e.

Seal all vent boots and furnace or water heater vents with a clear elastromeric sealant like Through the Roof....we handle several of these repairs a week in Atlanta through HandyANDY and Through the Roof is good for 20 years....great product.When you seal the boots, run a bead of sealant over the tops of the gasket that slides along the vent pipe.  

It simply states 2 coats of asphalt sealant and stripping the pavement marking.

Sealing limestone from the inside can create more issues down the road because the limestone leaks naturally and water will become trapped between the limestone and whatever you put on it and the sealant will start to fall off or leak.It's better to tackle the water issue from the outside: Sealing the walls from the outside (lots of digging), making sure water drains away from the house when it rains, proper gutter systems that lead the rain water away from the flower beds.Sometimes you also have to install a sump system.

Even a pipe or junction boxes in a rated wall or ceiling has to have fire sealant that is red.