I live in a rented apartment and there is a leak in the shower as it wasn't tanked when the place was built 15 years ago. Water is getting through the grout now and into the apartment below. Landlord had a plumber cover over the top of the tiles with blue tanking slurry, brushed on, as they are busy and can't rip out and replace the whole shower for a few weeks. I've been advised to leave it for 24/48hours to make sure it's dried. Once dried is this stuff harmful to your skin etc? Is it safe enough to have hot showers with this on top of the tiles? I would appreciate any advice on this. Sorry I didn't see any brands on the slurry tub, so I don't know the exact kind used.