Porcelain Tile Installation Grouting Process.
Once tile has been installed and has dried properly, the grouting process can begin. But, allow tile to set firmly before grouting. Grouting tile too soon, before the setting material has set-up, can lead to problems. Uncured setting material may bleed through the joints and discolor the grout. There is also the risk of destroying the bond by shifting tiles, so allow as much time between setting and grouting as feasible. A day is advisable, but as much as four days might add a level of assurance.