I'm currently working on renewing a concrete staircase going to the garden. The shape of the stairs make it a very time-consuming job, as every step needs several custom cuts. Currently I've 3 steps done with the tiles (glass mosaic) on flex thinset and no grouting yet.
I've always heard that it's critical to prevent water going into the thinset while it's drying and they are forecasting rain for tomorrow. Should I be concerned and take measures to cover the worked steps? Or I just need to let it dry well before grouting?