Preserving (horsehair) plaster in 1880 row home, advice please
I just recently bought my first home; an 1880 row house. It has many of the original features which is what I love about it, but the plaster situation has me in a bit of a pickle.
Until now, I have not been familiar with historic plaster. I have read some about it and I have reason to believe I am down to the rough layer of lime plaster (it appears to be comprised of a combo of sand, horsehair, and perhaps a lime mixture). The top half of the wall has areas with big holes, crumbling edges, old repair patches and cracks. The bottom portion unfortunately was literally disintegrated under the layers of old wall paper. I have removed as much of the wall paper as possible and now want to seal and harden the plaster, repair the holes and cracks, and properly finish it. I am at a loss for how to do this properly. Any help is appreciated.