Can you use gripper paint when painting over wallpaper?

Don't use just any paint or primer when attempting to cover wallpaper. The moisture in paint and primer will cause your wallpaper to lift at the seems and bubble everywhere else, and they will not go away by themselves. Binzer, if I remember correctly, makes a shellac primer that dries very, very quickly and does not give the wallpaper enough time to bubble. A Word of advise on the shellac: be absolutely sure to use enough ventilation. You will need to open the room as much as possible in which it is being applied. Buy yourself one of the $25.00 respirators with the filter on each side. All this may seem like a hassle but it will save you much aggravation and time.

That's Zinnser BIN primer that is being referred to. Works great! See the related link.