Hello! I want to paint my bathroom, after peeling off the wallpaper I can't figure out what is going on with the walls. It's seems to be different layers of plaster? There are cracks and peeling and it almost looks like a square outline stamped into the plaster to resemble tile? I'm not sure how to even begin the project and of course I'm on a budget. I will arraca a photo and hopefully you all have some advice! House was built in 1950's and also import to note, no exhaust fan in bathroom. Whatever treatment goes in the walls has to stand up to moisture. Thanks in advance.