Can You Apply Drywall To Wallpaper,do You Have To Paint First?

You need to at least prime the wall before wallpapering to seal it because the drywall is porous and will suck up the glue from the wall paper which can result in the paper letting go of the wall or cracking over time.
Also, if you ever get tired of that wall paper and want to paint the walls, you will have a difficult time removing the paper without damaging the bare drywall behind it.
  If it were me, I'd prime and then put a coat of satin paint over the drywall before applying the paper.

You need to at least prime the wall before wallpapering to seal it because the drywall is porous and will suck up the glue from the wall paper which can result in the paper letting go of the wall or cracking over time. www.wallpapersmania.ro