While mounting a monitor on my wall I decided to add an outlet as well. While cutting through the wall (it is an exterior wall) I noticed the wall was thicker than just drywall. The main problem I had was the paint later that kept chipping as I tried to cut a hole (with a jab saw) for the old work box, and now I have small repairs to make.
Can anyone tell me
What these layers are, I know one is drywall, oddly enough its the inner layer, but I dont know the other 2.
How can I repair the chipping that took place? Is it just spackle like normal drywall?
Most important, is there anything I can do to keep the chipping from happening in the future?