Last year about this time I re-grouted our bathroom tile but the tiles have cracks and they move around when you walk on them. This has made some of the grout break and come apart again. Here is a picture of one of the cracked tiles. They were like this when we bought the house.
I decided to try to glue the cracks together to help them not crack more or the grout to break apart. To do this I got some glue from the store.







