Remove the tile and prepare the wall according to the corresponding instructions above or tile over the existing tile.
Mudding a wall before tiling.
Vacuum clean and wipe the walls.
Sand the area with medium grit sandpaper until even and vacuum up the dust.
You may also paint this area if only tiling a portion of the wall to minimize cut in work around the tile.
Do a precise measurement of the surface.
The technique of layering means for you to apply one layer of filler and let it dry before you apply the next coat.
Use even pressure and do not force the primer onto the.
If the drywall dust is not removed before applying the primer the primer will not stick to the wall.
If existing tiles are beyond repair remove the tile and install a piece of wallboard in its place.
To do so make sure all of the tiles are intact and secure.
Drywall is smooth flat and easy to install.
How to make a plaster wall level before adding tiles.
The definition of level is expertly argued on points that range from the shape of earth to the surface s relation to the plane of the seas.
Prime the surface prior to the tiling.
Start with planning your wall tile installation.
If it was just a small spot ok.
Poor adhesion causes texture to peel and bubble from the wall and create an unprofessional looking texture and plaster finish.
Application roll on the primer the same way you paint a wall.
Sealing your shower walls is essential for tiling the surface to prevent moisture from effecting the integrity of your tile installation.
As for mudding to make it even i would not even attempt it.
Plywood or drywall is insufficient as a subfloor because it is a permeable material that will rot away when exposed to water.
Wash the wall with tsp tri sodium phosphate or an ammonia based cleaner to remove any grease or oil.
I would redo the wall yes more work and a delay but it is not a patch it will be right when you finish it and all those other issues you bring up will also be addressed in one instance.
How to use mud on uneven drywall.
Even walls covered in drywall.
Prime to seal it and let dry.
Cement backer board a type of wall.
Repair any loose or cracked tiles.