You could repair that damage by using standard joint compound not the lightweight variety or spackle.
Replaster bathroom wall.
How to plaster a wall a beginners guide tutorial for the diy enthusiast.
At the top of your stroke slide the trowel over 2 3 inches 5 8cm then reverse the motion and bring it down again.
Including how to mix and apply pva mix plaster apply plaster and finish plaster.
You can also use a hair dryer or heat gun on low to speed up the process.
Do your best to remove the damaged plaster.
Smear the plaster onto the wall starting with the bottom corner.
If you can avoid using the shower for a few days to let it dry out more.
Hi firstly i am a plastering rendering amateur only hard walling up to this point.
Because if the patches are large or extensive it simply isn t worth doing you ll never get a surface good enough to paint or wallpaper on.
Crouch down and push the plaster up the wall in a gentle arc standing as you go to reach the higher parts.
Use a drywall knife or other scraping tool to gently scrape away any peeling or soft.
3 walls are your standard house brick and the 4th is an internal wall made of black 35mm thick air brick nasty stuff but not an option to remove.