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Cut pieces will have a straight edge that will clash with the tumbled marble look of the tiles when set against the exposed edge of the shower wall. Use a sanding stone to soften the edge, rendering a tumbled look.
Set these cut pieces individually along the edge using thinset, making sure the pieces lie up straight with the outside edge.
In our project, we set a decorative 3-inch mosaic border at the top of the shower walls between the second and third panel from the top. Because the border tiles are thicker than the other tiles, apply a thinner layer of thinset.
Finish setting the tiles on all sides of the shower with thinset (Image 1).
If you find that you've applied too much thinset and it comes through the joints, take a screwdriver and scrape the excess thinset out (Image 2). When the extra thinset dries, you will have a difficult time removing it and most likely it will not match the color of the grout.