I'm sure there's been a thread about this in the past, but I cannot seem to find it. The hallway of our 1792 home was replastered by the previous owners in the early 70s. Removing a window in this hallway revealed very old horsehair plaster beneath the current surface, which is about 1/4 thick. The plaster is unpainted and almost stucco like (and its grey and depressing looking). I tried sanding a small patch of it, but I'm concerned that there might be asbestos or lead in the plaster, and frankly, it seems like a better idea to resurface the entire hallway. I'm considering doing this myself...any experience with this? Advice?