LAST EDITED ON 28-Dec-01 AT 02:32 PM (PST)
 
<<Any ideas about adding cement in the lime putty to
<<make it more resistant? The fresco painter Jean
<<Charlot did it in the 50's, his work is in perfect
<<shape today, it doesn't look like the cement damaged
<<the pigments or the lime mortar.

Hi Mathieu,

The pigments are fine with cement, the problem is a setting time - more cement - the faster the plaster sets. If added to intonaco you will have only a couple or so hours of painting time. Unless you paint outdoors you should not add cement to arriccio (brown) coat and intonaco.

You should add cement to scratch coat and perhaps to rough coat.

Read the article on preparation:

http://www.truefresco.com/albuquerque/preparation_albuq.html

for your (prev. painted and cleaned) wall I would line it up with tar paper attach/fasten expanded metal mash (found in masonry yard) and use scratch/rough/brown(arriccio)intonaco. or take a hammer and a grinder with concrete disks and "wack" (score, dent, grove) the wall - that will be your scratch coat. You can use "concrete" glue from masonry yard but do not put it into the mix, just apply it to the wall before the first(rough) coat 2-3-8 (cement-lime-sand)

http://www.truefresco.com/workshop