I purchased some ready-to-use grout which Charlie spread onto the tiles.
Charlie regrouted the entire shower wall back in 2012 with how-to explanation here. This time he grouted only the areas that were freshly tiled.
The directions on the grout container said to let the grout dry overnight before totally cleaning the haze off the tiles.
Grout was also used to fill-in notches that had been made in two tiles when an old-fashioned medicine cabinet hung on the wall.
The crack that started the retiling has been fixed.
Next step: skim coat the rough walls in preparation for wallpaper.
Do you misplace tools between projects?