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Yes, you can tile over existing tiles in a bathroom, but it is not always recommended. For this method to be successful, the original tile surface must be clean, flat, and free of damage such as cracks, unevenness, mold, or mildew. While tiling over existing tiles can save time and money, there are potential drawbacks. The new adhesive may not bond properly, and the process adds extra weight to the wall or floor. Additionally, the increased height of the surface could interfere with door clearances. For the best and most durable results, removing the old tiles before installing new ones is generally the better option.

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.

Whether you use a brush or roller depends on the size, shape, and amount of tiles. Rollers are easier to maneuver over large areas and can apply a more even coat of paint in a shorter time frame with no visible brushstrokes. Brushes are best for precision work, particularly in very small areas. If you don't want visible brushstrokes on your painted tiles, you can paint details with small foam brushes instead of bristled paint brushes.

Tile installation can be expensive because it requires more time and labor to install than many other materials. For example, laminate flooring can click and lock into place, and carpet comes in large rolls that you can secure to the floor. On the other hand, tiles need to be cut, laid individually, grouted, and left to cure.