Grout: The Final Step
After the mortar holding the edge tile has cured for 24 hours, the author spreads sanded grout on the glass block using a rubber-edged grout float. As with grouting a tile wall, diagonal strokes ensure that the joints get filled completely.
He lets the grout sit for 15 minutes or so and tests it with his finger before beginning the cleanup.
When the grout has set up sufficiently, he gives the block an initial wipe with a clean sponge, rinsing the sponge often in clean water …
… and then wipes down the wall a second time with the sponge and fresh water.
Next, he goes over the wall with highly-absorbent paper towel to remove the grout haze and any residual moisture.
A final wipe with a clean paper towel finishes the job.
Capping the Edge