On Tue, 29 Dec 2015 14:29:08 -0800, "Eagle"
wrote:

George submitted this idea :
We want to re-paint a room. Walls are old plaster (presumably original,
so ~90 yo), with what looks like 3 layers of paint. Based on age, the
paint is likely oil-base. Some of the paint has pealed to bare plaster;
the rest seems well-bonded. So, primer has to bond to both plaster and
old paint.

Question: is there a preferrable primer to use? Or ones to avoid?

Thanks

REAL plaster walls? Redwood lath? Love it!

Try not to get too excited. This is kind of old-school (1920's?) skim
coat, about 1/4" thick. In the right light, the lath telegraphs
through. (We prefer not to notice.)