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The best trowel for penny tile is a 3/16-inch-by-5/32-inch V-notch trowel. Because of the small size of the penny tile, you want a trowel with small notches that can lay a thin layer of mortar on the surface you’re tiling. If the notches are too wide, you risk applying too thick of a layer of mortar, and it can squeeze out between the penny tiles.

Using caulk is one of the simplest and most recommended methods to finish glass tile edges. It creates an elegant seam between the glass tile and the adjacent area, along with a waterproof seal. With this method, you want to use a caulk color that matches the grout and, along with the grout, compliments the tile. Make sure the caulk line is smooth and even. Alternatively, you can use a bullnose or tile trimming to edge, however, that will also require caulk to seal.

The tile spacing you should use will depend on the tile and where you’re installing it. Choosing the right tile spacers to maintain a consistent gap between your tiles is tricky. Generally, tile spacing shouldn’t be less than 2 millimeters on walls and 3 millimeters on floors because of stress relief requirements. Getting it wrong can result in uneven tiles and early repairs.

For glass tile, you want to use unsanded grout. Sanded grout is a stronger and grittier cement grout that is great for installing tiles with wider gaps and into joints. However, it is susceptible to scratching glass tile and is more difficult to use in thinner gaps. Unsanded grout, while more expensive, is easier to fit between thin gaps and is less harsh on delicate materials, like glass tile.