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.
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.
Most kitchen and bath supply and design stores stock bath and shower liners which can cover ugly shower tile.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
This gives the tub surround sealant a stronger hold.
Don t worry if you do pull a bit of plaster when stripping the tiles as it s easy enough to replace.
Typically screws secure each of these items in.
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Tile on tile or as i say it.
If your old tiles are loose drummy lifting too uneven or badly damaged they are better off removed.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
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.
Grind them down with a grinder.
This option is less labor intensive than painting or replacing the tile but it s not.
Roughen the tile with 80 grit sandpaper.
Bjd building roofing say.
How to install a shower surround over existing tiles step 1.
Tiling on tiles like this will not improve the problems.
Lay a level on the old tile and mark any high spots.
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.
Scratch the tile with sandpaper to rough up the surface.
And it lasts for 20 years.
Then rinse the wall with a water dampened.
While tiling on tile is a great solution for outdated tiles it s no solution for an existing tile job with issues.