No pics but I looked at a job the other day that is now my new ALL TIME WORST tile mistake made by a contractor.
We installed 2500sf of stone floors, and several custom showers in a very nice home 2 yrs ago.. Client feels sorry for out of work Mason doing some misc. work down the road...Mason offers to reseal clients stone floors for 100$...
Mason calls me to ask about Sealer turning "gummy" and how to fix it. Mason tells me he "poured" Mirramatte on the floor, spread it with a mop and left for the night.

I told him he could try Mirra Strip, and we sell it..But I think he's not gonna have much luck..He balks at the price of Mirra strip and says "I can get it off with Acid"
Client calls me that night crying ( literally) 1 Dog is dead, one is at the Vet..and the entire house is ruined.
Mason used Straight Muratic acid and slopped it everywhere..he left it overnight undiluted on the floor..came back next morning and put another coat on..That's when it was discovered the dog had died and every appliance in the house was rusting. It's so bad that the Flat screen Tv's don't work...
The Mason is not licensed and offered to "pay half the deductable"..