Wash the wall with tsp tri sodium phosphate or an ammonia based cleaner to remove any grease or oil.
Mudding a wall before tiling.
Prime the surface prior to the tiling.
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.
How to make a plaster wall level before adding tiles.
As for mudding to make it even i would not even attempt it.
Drywall is smooth flat and easy to install.
Even walls covered in drywall.
Repair any loose or cracked tiles.
Wipe with a damp cloth to remove any remaining dust and allow to dry.
You may also paint this area if only tiling a portion of the wall to minimize cut in work around the tile.
Start with planning your wall tile installation.
The technique of layering means for you to apply one layer of filler and let it dry before you apply the next coat.
If the drywall dust is not removed before applying the primer the primer will not stick to the wall.
Cement backer board a type of wall.
Sand the area with medium grit sandpaper until even and vacuum up the dust.
If existing tiles are beyond repair remove the tile and install a piece of wallboard in its place.
How to use mud on uneven drywall.
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.
Drywall sheets are a big improvement over plaster and lath type walls in older homes.
Plywood or drywall is insufficient as a subfloor because it is a permeable material that will rot away when exposed to water.
Do a precise measurement of the surface.
Poor adhesion causes texture to peel and bubble from the wall and create an unprofessional looking texture and plaster finish.
Vacuum clean and wipe the walls.
Sealing your shower walls is essential for tiling the surface to prevent moisture from effecting the integrity of your tile installation.
To do so make sure all of the tiles are intact and secure.
If it was just a small spot ok.
Count how many tiles you ll need.
Prime to seal it and let dry.