As much as i dispise pre mixed thinset for any application as a tile professional for 15 years i must strongly advise you to not give out advice to.
Tile over existing shower wall tile.
This gives the tub surround sealant a stronger hold.
If your old ceramic tile is worn or dated you can lay new tile right over the old and avoid the huge job of tearing out the old tile.
Don t worry if you do pull a bit of plaster when stripping the tiles as it s easy enough to replace.
Remove the faucet handle face plate spout and shower head.
Tile on tile or as i say it.
The surface of the existing tile should be free of mold and mildew completely level including grout and without any warping or strangely placed tiles that might otherwise interfere with a.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
This option is less labor intensive than painting or replacing the tile but it s not.
If your old tiles are loose drummy lifting too uneven or badly damaged they are better off removed.
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Layer newspaper on the floor across the bottom of the tiled wall.
Grind them down with a grinder.
You can tile over tiles with the right preparation but i would never do this the proper way is to strip right back to original wall finish.
If the existing shower is correctly installed there is no way that the tiles on the floor of the shower can be level as pitch from the walls to the drain is required for the water to drain.
Roughen the tile with 80 grit sandpaper.
While tiling on tile is a great solution for outdated tiles it s no solution for an existing tile job with issues.
Most kitchen and bath supply and design stores stock bath and shower liners which can cover ugly shower tile.
How to install a shower surround over existing tiles step 1.
Bjd building roofing say.
Then rinse the wall with a water dampened.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
Scratch the tile with sandpaper to rough up the surface.
And it lasts for 20 years.