If the ceramic tile substrate is stable, the first step is to remove old silicone, which can weaken the adhesion of subsequent finishing layers, leading to durability problems in the long term.
The next step is to matt the tiles using an orbital sander. This process allows for better adhesion of subsequent layers of material.
After matting the tiles, the next step is to fill the joints between the tiles. For this purpose, you can use a filling compound. This process involves applying the compound or mortar along the gaps between the tiles, which allows them to be filled solidly. Proper filling of the joints is important not only for aesthetic reasons, but also for functional reasons, as it ensures the tightness and durability of the entire surface.