Small cracks appearing in a bedroom wall
We moved into a house which was built in the late 1980's. Most of the house (except for bedrooms) had been wallpapered. Upstairs in one bedroom - after we moved in we noticed small cracks appearing in the walls. The wall is smooth and the cracks are small (hairline cracks) actually, but they are all over. My husband primed the wall with Kilz - but I have noticed a few of the cracks appearing again (it has been three days since he primed) and I don't want to paint until we solve the problem. What can be causing the problem - I don't think they had wallpaper on the walls before we moved in but I don't know for sure. Any suggestions?:(