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PseudoWongtong 12-28-2011 06:07 PM

Preparing solid plaster for painting
 
Hey there,

I am writing this on behalf of my family. We all know nothing about building/renovating/painting and have recently found ourselves in a situation where the foundations of our house have rotted due to damp (I think that's how you phrase it..!).

A professional plasterer is currently fixing up the exterior walls after replacing the foundations. He would like us to fix the cracks in the plaster ourselves (I'm not sure why), and we are hoping to paint the walls ourselves.

So my questions are:
1) How do we go about repairing cracks in the plaster? (Sorry if this question is in the wrong section)
2) How do we prepare the solid plaster for painting?

My parents purchased water-based paints and also Dulux Primacryl. Are these appropriate for our situation?

Thank you very much for your future replies.

joecaption 12-28-2011 06:17 PM

I'm confused, plaster is inside, stucco is outside. A real plasterer would know how to do the repairs and would never ask you to do them.
And no, you need oil base primer before latex paint. If not you may get what looks like tobacco stains running down the wall when painted with water based paint.

PseudoWongtong 12-28-2011 06:34 PM

Quote:

Originally Posted by joecaption (Post 805866)
I'm confused, plaster is inside, stucco is outside. A real plasterer would know how to do the repairs and would never ask you to do them.
And no, you need oil base primer before latex paint. If not you may get what looks like tobacco stains running down the wall when painted with water based paint.

Oh sorry, I mean stucco. Thank you for your help.

Brushjockey 12-28-2011 06:41 PM

Joe- Oil based primer on exterior stucco?
'Splain, bro. My understanding of stucco is you do want a breathable ( waterbased) coating. Luxon by SW comes to mind as often recommended.
Why would staining come through?

chrisn 12-29-2011 03:24 AM

Quote:

Originally Posted by Brushjockey (Post 805891)
Joe- Oil based primer on exterior stucco?
'Splain, bro. My understanding of stucco is you do want a breathable ( waterbased) coating. Luxon by SW comes to mind as often recommended.
Why would staining come through?

Inquiring minds would like to know:yes:

I bet he was thinking interior, but I have never seen staining like that.

user1007 12-29-2011 06:06 AM

I am confused too. If it is stucco on the outside and plaster on the inside? And why is the contractor asking you to make plaster repairs if he/she is resurfacing things?

One thing you do not want to do is race the cure time of either stucco or plaster. Let it dry before doing anything to it.

I would have no problem putting latex primers and paints over either dried and cured stucco or plaster. In fact, you do not want to use oil based products on anything alkiline like stucco and especially if it is prone to moisture problems.

On the interior, and others may disagree with me, but plaster should be repaired with plaster. Of course I have cheated and fixed minor things with hot mud drywall compound but the materials are as different as apples and oranges.

Plaster comes in different forms but patching plaster should work for repairs. It starts curing fairly fast but not like 5 minute hot drywall mud. Buy nice wide tools for surfacing it over repairs. You must cut out an problems from moisture and fix the source of them first.


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