Author Topic: Priming new plaster  (Read 4424 times)

Offline ProWallGuy

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Priming new plaster
« on: September 16, 2007, 10:24:01 PM »
It's been years since I have had to paint new plaster. I can't find any paperwork or notes on any job in the past that I have had to prime and paint new plaster. So, my question is this:

What would you recommend as a primer for new plaster? By new I mean it is a new plaster skimcoat, but has dried/cured for over 9 months. My first instinct would be an acrylic primer like BM FreshStart.

Any numbers as to material usage? I know it will be more porous than drywall, but how much? 50%? 100%? Anyone with a typical sq ft of coverage for new plaster?

Any help would be appreciated.


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Re: Priming new plaster
« Reply #1 on: September 17, 2007, 12:51:49 AM »
It could require as much as double the amount of primer, in my experience.  (That's how I estimate it for bids.)  Unfinished plaster is like a sponge for that first coat...

I have had to deal with plaster skimcoats & repairs on many occasions, my preferred primer is Zin 1-2-3 or equivalent.  Sealing qualities are key for this type of application, go with the acrylic primer you feel seals porosity best.  Oil based primer is not necessary nor recommended over fresh plaster.


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Re: Priming new plaster
« Reply #2 on: September 17, 2007, 10:17:17 AM »
Friend of mine redid his bathroom and used oil base on new plaster and now its cracking all over. This is inside a shower and older style home the plaster is overhead just above the tile so moisture is a huge issue in there, theres  no ventilation inside that shower area and moisture stands on the walls.