There is a simpler and more effective method. The tile that exfoliated, shattered or tapped (this can be several tiles adjacent to the exfoliated), you must again carefully remove it, trying not to damage it and not scratch the enamel. To do this, first you need to remove the grout from the seams and then carefully, shaking, remove the necessary tiles (or tiles). Sections of the solution that are not strong enough, you need to remove from the wall (or floor) and tiles. Then it is necessary to carefully clean the tile and the surface area where it was installed, from dust, and, without knocking down the entire solution, primed the surface. Further, cover the base and tiles with silicone abundantly, making a “net”, and install the tile in the same place, carefully pressing and leaving at the seams using blades or crosses. Silicon squeezed out from the seams should immediately be removed with a damp sponge or a rag moistened with vinegar, which perfectly cleanses the surface. After a day, the seams can be wiped with a grouting mixture.