QUESTIONHow do I seal a crack in my Ceramic Tile? - I have a hairline tile fracture in the coner on the floor of my shower from a repairman stepping on it or dropping something on it. How do I seal this?
ANSWERANSWER - The ceramic tile should not crack if it is stepped on or something is dropped on it. It could chip.
That fact that it cracked suggests that it wasn't properly installed and there are probably voids in the adhesive under the tile where it cracked.
To seal the hairline fracture, I would use a clear silicone sealant or clear epoxy. It may not last long and you will have to redo it. But if you don't have extra tile to replace it, then sealing it is about all you can do. As long as the shower pan was constructed properly having the hairline crack shouldn't do much harm. It will collect dirt and might lead to microbial growth at that spot. Plus if there are voids under the tile it might crack more than it currently as it is subjected to more use. Good Luck.