Q-Is there a waiting period before painting over new plaster? A-Years ago, a waiting period of six months was usually recommended before painting new plaster, to let the plaster dry thoroughly. Better ...

When our apartment building was first constructed in 1927, the interior walls in the hallways and stairs (plaster over concrete) were patterned to look like stones in a castle. See the attached photo.

EXPANDED perlite, which is made by rapidly heating small particles of suitable volcanic glass, has recently been used extensively as a lightweight aggregate for gypsum plaster and concrete in the ...