Grouting over a sand topping mix?

I'm making a mosaic panel with the equivalent of tiles that are approximately one inch deep. I'm using a sand topping mix to fill in the deep gaps but would like to use a thin layer of grout as a finish coat on top of that. How long after I apply the cement should I wait before I apply the layer of grout?

mikeasaurus2 months ago

It should say on the topping mix and grout the suggested application times. Since different types cure differently, I defer to the manufacturer on this one.