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Make sure that all the wallpaper is securely adhered as well. The moisture in the paint sometimes lifts some of the wallpaper. As rankrank55 says...preparation is ultimate.
You Can But What Will Happen Is The Moisture In The Paint Will Loosing Some , Not All, But A Few Places On The Wall. In Essence You Have Some Bubbles That Will Come Up, Youll Have To Cut Them Out With A Razor Knife And Then Mud Over Them A Few Times And Then Sand, Prime And Paint Over The Spot. You Will Also See All The Seams Where The Wall Paper Meets The Other.
If You Dont Mind This, Ok But If You Do Youll Need To Treat Each Joint As A Sheetrock Joint, With Tape And 3 Coats Of Mud. Sand ,prime And Paint
You will be able to see the seams unless you do something about that before painting. We found it better in the long run to remove the paper, then paint.
If the paper wasn't strippable, we peeled off as much as we could and then soaked sections with warm water and peeled those off. We scraped the walls that were under the paper and smoothed them out, spackled to fill holes, smoothed on goop, then primed when that was dry. Then we sanded. And sanded. And sanded.
Hey, gang....I have painted over a lot of my wallpaper in this "lil ol house". I sandpaper the seams, as a matter of fact I am doing this right now. If the wallpaper is really well bonded, I haven't had a problem. Do some test areas. Right now, there is a lot of companies that have paintable wallpaper. It has an inherent raised design. Great for rough walls. It's already primed. Install & paint. I am doing a large wall (27x12) right now with faux painting....it looks "Martha Stewart" O.K. Have fun, nothing ventured, nothing gained.