If the mortar is not loose, only the tiles fall off. After the mortar on the back and around the tiles are scraped off, add a little cement to the paste in 107 to form a paste. Apply a thin layer evenly on the back of the tile. After pressing the tile, it will stick firmly.
If the mortar is dropped together with the tiles, first lightly plucking some of the pits on the original foundation surface, re-embedding with mortar mixed with 107 glue, or using cement, E-44 epoxy resin, acetone, ethylenediamine (chemicals) After mixing in a ratio of 5:3:2:1, brush a layer on the base surface with a brush and press the peeled tile up until the mortar hardens.
It should be noted that if the tiles only partially fall off, do not use force to hit the mortar on the foundation surface to prevent vibrations and loosen the original solid tiles.
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