I don't know what exact type of wall this is. The drill went through it real smoothly without any ear-splitting noise. It was like particle board or something, and the outer coating seems plasticky.
What do you think is too close to drill holes together that they might cause cracks or something? Would it stabilize it to put some liquid wood stuff into the first hole and let it dry?
Do you think just leave it? (Eventually when when selling this place it will probably need to be removed or corrected.) Or do you think I should move all of them a few inches away from the original holes? But if I fill them in and paint over them that will probably show.
Thanks in advance.