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Pour about an inch and a half of water into a bucket and add thinset. Use a drill with a whip attachment to mix, and let it slake for about 15 minutes.
Cut the glass tile sheets in half with a utility knife (Image 1). Use a tile nipper to cut the individual tiles in half to fill in the gaps (Image 2).
Wipe the concrete shower pan off with a damp sponge. Dry concrete has a layer of dust which would impede the adhesion of the thinset.
Drop thinset onto the concrete with a corner trowel, and smooth it out with the flat edge of a trowel. Remove any excess until it is about 1/8" thick.
Drag a second, thinner layer with the v-notched edge of the trowel. Graze over the top layer with the flat edge, creating a smooth surface. This step is necessary for glass tile to ensure the grooves do not show through the tile.
Lay out the sheets of tile and press gently around the entire surface (Image 1). Put all the full and half sheets in place, and fill in the gaps with the individual tiles (Image 2).
To remove the backing from the tile, wet the back with a sponge. Let it sit for a few minutes, and peel it off. Scrub the excess paper and adhesive off and clean the thinset from the joints