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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.

You can use sanded or unsanded grout for a shower pan, but sanded grout isn’t the best option for shower walls. For those areas, you’ll want to use unsanded grout, which works well on vertical surfaces and is less likely to slump than sanded grout. Alternatively, you can use epoxy grout for shower walls.

There are several different products that allow underwater repair. Pool putty can help repair chips, cracks, and loose tiles without draining your pool, but it should only be used for a temporary fix. Certain two-part epoxy adhesives will cure underwater, too. That said, while it is technically possible to fix pool tiles underwater, it is usually not ideal, depending on the depth of your pool. You will still have to reach the tile, which means you might have to dive and make the repair while submerged.

Updating your backsplash without removing the tile is possible in a couple of different ways. First, you can remove the old grout and replace it with new grout to give your backsplash a fresh look. You can also change the grout color, which can have a surprisingly large impact on the final appearance of the backsplash. Finally, you can paint the original tile to totally change the look of the backsplash without removing it.