This is a 90 year old lath and plaster wall that was cut into to install a thermostat. The hole is 1.5" by 14".
Should we use:
- drywall patch
- mesh tape and joint compound
- just plaster
- something else?
If plaster, which type (Plaster of Paris or Lime Plaster) or brand do you recommend?
Also, do I need to put anything in front of the black cord before patching?