Okay, I know that you’re not supposed to use regular joint compound to patch plaster walls. Project I’m on now has some small divots taken out in a few places. Is the incompatibility an issue if the damaged area has been primed (water-borne alkyd primer in this case)?
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Shouldn't be a problem at all if you prime the walls first.
Bob
I repair plaster frequently using joint compound. Usually I use the setting type compounds because they don't shrink. And like you, I prime first.
I use latex (water-based) primers. What is a water-borne alkyd primer? Who makes it?
I'll have to check tomorrow, my painter uses it. He sells himself as a green painter, really researches a lot of products.
Last summer I saw a job he was doing with some Scandinavian paint. All linseed oil, no petroleum products, self-priming. Also came out looking like glass. Beautiful stuff, but I think it cost about $45 a quart.
"What is a water-borne alkyd primer? "Don't bother looking for it. Even though it is water-borne the resin is still alkyd, not a latex emulsion, so not good over cement or plaster.I learned when I was in the paint industry that alkyd resins become degraded in contact with alkali substrates; latex does not, nor does PVA. Translation; don't put alkyds on cement or plaster (DaVinci learned that when he painted the "Last Supper" on plaster with oil paints instead of fresco). Water-borne alkyds have been used for many years for alkyd quality finishes with low VOC in industrial and automotive painting. BruceT
Can also prime with HyBond, or concrete bonding agent from HD - smells suspiciously like Elmer's glue. I do (prime with it, not smell like Elmer's glue).
Forrest
I've been using joint compound to repair lath and plaster walls for the last 40 years with no problems. I wish you'd told me sooner that I couldn't do that.
Lately I've been mixing in a little POP so it would set up quicker.
Ozlander
I've been using joint compound to repair lath and plaster walls for the last 40 years with no problems. I wish you'd told me sooner that I couldn't do that.
I heard that it doesn't hold up well long-term and that you start getting callbacks after about 41 years :-)
LOLAll that work in '66 is now ready for repair/renovation. You did it too well, should be retired by now!Scott
Let them call, I'm retired.
However I'm working on my 1920's house that has been remodeled several times, stairwell and upstairs bedroom added many years ago. Downstairs bathroom door (28" x 75") was moved before we bought the house. It's now 32 x 82. So I get the straighten, fix plaster walls.
Ozlander