On Sun, 24 Feb 2008 13:18:32 -0800 (PST), Chris
wrote:

I am removing wallpaper in an 80 year old house. Underneath the
wallpaper is plater walls. In many areas, the top coat is cracking, or
buldging away from the horsehair base. The base is still solid and
intact. ...

Some ppl who seem to know plaster, and love to talk:
http://www.i-boards.com/bnp/wc/default.asp

G