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-   -   Possible to spot prime cured plaster? (http://www.diychatroom.com/f4/possible-spot-prime-cured-plaster-135962/)

Neil H 03-04-2012 08:57 PM

Possible to spot prime cured plaster?
 
I bought a house in August which was built in 1929 and has plaster walls. I had plaster work done in late October in a guest room (mostly to fix cracks, but some water damage) and I'm finally getting around to painting it.

I went to Duron Paints for a primer and they recommended Terminator Stain Killer 2 which is water-based (and it's white, not tinted). Can I spot prime the areas that were re-plastered? Or does it make more sense to apply the primer to all the walls?

The original walls were painted a light beige and I plan to paint it a light green (which is only slightly darker than the current color). Will spot priming over the plaster work cause "flashing" of the topcoat?

Thanks in advance,

Neil

joecaption 03-04-2012 09:06 PM

When it comes to plaster walls I like to use oil based primer not latex.
Reason being I've seen plaster do some funky things, brown stains running down the wall, white spots flashing through ect.
Once the primer is dry you can go over it with ever paint you want.

Brushjockey 03-04-2012 09:11 PM

Yes you can- but a couple of questions- if the walls were patched, chances are they used modern taping compounds, either dry and/ or premixed . It does happen, but rare that someone would use limed plaster.
Do you know what they used?
What you want to do now is get even porosity on your walls. Depending on what sheen you are going to, it would make sense to spot prime the patches and then do an overall prime, at least to the wall(s) that the patch was on. If you are going to a flat, not so much of a concern.
Expect 2 top coats.

Neil H 03-04-2012 09:12 PM

@joecaption: Are you suggesting I can spot prime with an oil-based primer?

Brushjockey 03-04-2012 09:13 PM

And joe- the funky things you saw were not from the cured plaster, they would be from glue no PASTE or contaminates on the wall. Cured plaster does not stain.

(forum joke..)

Brushjockey 03-04-2012 09:14 PM

That is what joe said. I do this with acrylics all the time.

Neil H 03-04-2012 09:15 PM

@BrushJockey: I don't know what was in the plaster. But I'm planning on using a flat paint. That said, you think I can use two topcoats after spot-priming?

Brushjockey 03-04-2012 09:18 PM

Sure. If you see anything weird ( I don't expect you will) come through the prime come back and tell us about it before finishing.

Brushjockey 03-04-2012 09:54 PM

Oh- Caught the water damage part- if the patches have a sign of brownness bleeding through, then i would agree with joe about the oil. The waterbase stuff you have "might " do it, but a water stain is best kept back by something that isn't waterbased.
Technology is changing fast on this , so there are exceptions. Not familiar with that product.
If you already have it- try it. And even if it bleeds a little, let it dry well and reprime the stain.
Sometimes you can "trap"the stain in the first coat and seal it with the second.
If that doesn't work, use oil on the stain itself, otherwise prime as before.

chrisn 03-05-2012 04:11 AM

Quote:

Originally Posted by Brushjockey (Post 870604)
And joe- the funky things you saw were not from the cured plaster, they would be from glue no PASTE or contaminates on the wall. Cured plaster does not stain.

(forum joke..)

I am keeping my eyes open:laughing:


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