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Thinset mortar is the best adhesive for ceramic tiles on concrete. It is easy to work with and has a slower dry time than mastic or epoxy mortars. This longer dry time gives the installer more time to adjust tiles, which is especially useful for DIYers who may not have tile installation experience. It can also be built up to help level any depressions or gaps in the concrete subfloor.

No, you don’t need to remove the old grout before installing new tile over existing tile. In fact, the old grout helps fill in gaps between tiles, creating a more even surface for the new layer. However, it's important to ensure that the grout is clean, solid, and free of cracks or crumbling areas. Damaged grout should be repaired or replaced before proceeding. Cleaning the surface thoroughly and filling any low spots will help the new adhesive bond properly and ensure a smooth, stable installation.

Like glass tiles, you will not need to seal most porcelain tiles, particularly if the porcelain is already glazed. It depends on quality. Porcelain is very water resistant, but it is not 100% waterproof. To avoid staining, some homeowners use a penetrating sealer. It is also a good idea to seal your grout. Unless you use epoxy grout, grout is very porous and can harbor bacteria, mold, and mildew.

The choice of whether to tile or use an acrylic tub surround is up to you and can be based on a number of factors, including aesthetics, cost, waterproofing, ease of cleaning, and maintenance.

Tile is a beautiful, classic bathtub surround choice; while tile installation cost is higher, it’s customizable and offers visual appeal. Tile is also harder to clean and presents waterproofing problems because of grout lines. Acrylic surrounds can be more affordable, don’t require much maintenance, and are easier to clean. However, they aren’t usually as visually appealing and may need to be replaced if they become damaged.