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I bought some pre-pasted wallpaper, opened a package, and the directions say to prime the wall. I have vinyl wallboard and have painted without priming (with Valspar) and the paint adhered well and is still going strong. So it seems to me that since paint will stick to my walls without priming, wallpaper should stick without priming, right? I have a feeling you're going to say, "Wrong." LOL To be honest, I bought the wallpaper so I wouldn't have to paint, and now I'm going to be stuck painting (primer) anyway? waaaaaa!!!!
I think the priming is so the border will strip off easily when you decide to remodel and to give "tooth" to the adhesive. I primed and put up border a while back. It stuck just fine and came off very easily when I decided to repaint. If your painted wall is clean and flat paint and you intend to never change, don't prime. If you are going over satin, eggshell or semi gloss paint, you should prime or the border might not stick.