Have you ever painted over wallpaper and how did it work out?

If the wallpaper is not loose you will be fine but I would not paint the wll with semi gloss Semi gloss will show every imperfection on the wall. And if it is a old house there is probably a lot even with the wallpaper on the wall. I would go to the Nearest Walmart and get a can of eggshell or satin latex wall paint . It will be washable and durable without all that shine of semi gloss. A gallon of paint at Walmart a good brand like Kilz or Dutch Boy will cost about 20.00 a gallon That will do a large room . .If the paper is a light color you should only need to do one coat of paint . I hope that this helps. Happy redecorating