Ok, so I was pealing off the wallpaper in the basement bathroom where we have a single standing wall. The standup shower is on one side and nothing is on the other...just a mirror hanging. Well, the corner of the wall was bubbling....as I pealed the wallpaper off, this plaster started falling off and there seems to be a metal piece that is rusted. Is this a problem? Can I just re-plaster this metal piece or should I remove it and put another piece up?? Our basement is very moist in the summer. I plan on putting a dehumidifier in there for the summer months but I can't afford a major project. It's our second bathroom and it's in our finished basement. Not a big deal. What's the best way/ cheapest to repair this until we can afford redoing the bathroom??