Grouting - step 1
Prior to grouting, tiles should be dry and the thinset adhesive firm.
Sanded grouts may scratch the surface of some tiles. Non-sanded grouts are preferable for narrow grout joints – consult your dealer or manufacturer for the right grout for your tile and installation.
Use a grout float to apply the grout, making diagonal and back-and-forth movements to work the grout in. Use the end of the grout float to press in the grout. For translucent tile, grout joints should be filled to less than the thickness of the tile. This allows light to reflect on the tile's internal surfaces, which will enhance the tile's luminescence.