I have grouted one panel of this 26 foot mosaic ( 6 panels total) and two are set in the thinset- grouting those tonight. It's a marathon session but I am motivated to get it done!
I am testing the grout here- on a piece I had in the studio.
Here is the grouted piece. Hard to get a good photo but it looks amazing!
Here is a section of the next panel-
I continue on- almost halfway through!