Best way to prepare old plaster for painting?
We have an 1820's Federalist house currently undergoing a major restoration. The dining room had wallpaper that we removed. Underneath is the original horse hair plaster. It is a little rough and has some cracks and fault lines in it.
When we did some of the other rooms a while ago, we hired someone who used joint compound (aka drywall "mud") on the entire wall. I have also heard recommendations for Redi-Patch. The walls have wainscoating and a plate rail, so the surfaces that will be painted are not more than 4' from top to bottom.
What's the best way to prepare this surface for painting so I get a smooth surface?