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Old 03-04-2010, 11:15 PM   #21
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So far on new homes, we have done plaster 3 times and never let wait and have not seen any issues.
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Old 03-04-2010, 11:24 PM   #22
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I would just like to add that Emulsi bond is a good product to add to an acrylic primer (in my opinion). Muralo, if you can find it or Aqua lock I think are good ones for plaster. But these days, since Sherwin Williams bought everything up and changed the formulas, it's hard to know what is what anymore.
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Old 03-06-2010, 12:43 AM   #23
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Originally Posted by DeanV View Post
From what I have heard, with old, lime based plaster the water from latex primers would spike the pH even higher when it reacted with the lime, causing failure, so oil was used to avoid spiking the pH. Now, waterbased does not spike the pH in modern plaster since there is no to very little lime.
Dean, that's the first I've heard that.

I wonder if it was the ammonia content in the old latexes that spiked the pH, and not the water.

And then if one used oil on "hot" lime plaster, the risk of saponification was high.

One of the books I read about plastering said that some houses with full three coat lime plaster were not painted for a full year !!!

No wonder calcimine was used

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Old 03-06-2010, 01:14 PM   #24
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thanks for all the good advice guys. and double thanks for not going on for 15 pages with inside jokes..
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