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Old 07-26-2013, 12:47 AM   #1
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cure plaster if covering if with a layer of joint compound before paint?


So I have a wall that I had to replaster. Usually, what I do with plaster walls is, because I am never happy with the smoothness of plaster alone, apply blue lightweight drywall joint compound and sand it before painting, that way plaster looks as smooth as drywall.


Now, I know the theory that lime-based plasters (which is exactly what I use) require up to a month or longer to cure and should not be painted before. What I am not sure is how things change if joint compound is applied: does the plaster need to cure on open air regardless of paint or is it just bad to put paint directly on plaster before it is cured? Because the latter case would not apply if there is a layer of drywall mud between the plaster and paint.

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Old 07-26-2013, 09:03 AM   #2
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cure plaster if covering if with a layer of joint compound before paint?


The reason for allowing plaster to cure is to be sure all the moisture is gone. Wether you put paint or joint compound over the plaster you are affecting that process. In my opinion you will be chancing bubbling and peeling paint either way

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Old 07-28-2013, 09:07 PM   #3
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cure plaster if covering if with a layer of joint compound before paint?


buy a dehumidifier....
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Old 07-29-2013, 05:58 PM   #4
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cure plaster if covering if with a layer of joint compound before paint?


I personally do not like mixing plaster and drywall compound that way but perhaps a skim coat may work. They are different density materials though and heat and cool, expand and contract at different rates. And plaster experts that have done work with me can get a near polished surface with a final Venetian plaster type finish. And just curious, if a drywall like wall is what you wanted why would you go to the trouble of re-plastering?

In any event, you risk all kinds of problems not allowing the plaster adequate time to cure. I suppose a lime finish over fresh plaster might create less problems but even then I would wait it out. Even it would likely look blotchy.

Otherwise, as mentioned, a dehumidifier and ventilation is a good idea.
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Old 07-29-2013, 06:13 PM   #5
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cure plaster if covering if with a layer of joint compound before paint?


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Originally Posted by sdsester View Post
I personally do not like mixing plaster and drywall compound that way but perhaps a skim coat may work. They are different density materials though and heat and cool, expand and contract at different rates. And plaster experts that have done work with me can get a near polished surface with a final Venetian plaster type finish. And just curious, if a drywall like wall is what you wanted why would you go to the trouble of re-plastering?

In any event, you risk all kinds of problems not allowing the plaster adequate time to cure. I suppose a lime finish over fresh plaster might create less problems but even then I would wait it out. Even it would likely look blotchy.

Otherwise, as mentioned, a dehumidifier and ventilation is a good idea.
Also my question.
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Old 07-29-2013, 06:31 PM   #6
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cure plaster if covering if with a layer of joint compound before paint?


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Originally Posted by sdsester View Post
And just curious, if a drywall like wall is what you wanted why would you go to the trouble of re-plastering?
because the background is brick, i.e. no stud framing to hang drywall on
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Old 07-31-2013, 05:43 PM   #7
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cure plaster if covering if with a layer of joint compound before paint?


Darn 1x2 furring strips would have been a lot cheaper and easier than plastering.
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Old 07-31-2013, 05:47 PM   #8
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cure plaster if covering if with a layer of joint compound before paint?


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Darn 1x2 furring strips would have been a lot cheaper and easier than plastering.
The wall was uneven + many other ins and outs that are not worth describing.
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Old 07-31-2013, 07:06 PM   #9
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cure plaster if covering if with a layer of joint compound before paint?


I think I get it, but why would you put an unlike material to plaster like drywall compound if you have the obvious skills to do something like plaster in the first place? Why not make your finish coat Venetian plaster or something?

I guess I am missing something. Would not be the first time.

I just do not get why you would take the time to plaster a new wall (over brick and mortar) and then use drywall compound for the final coats. It makes no sense to me.

Why the adversion to something like Venetian plaster finish coat if you have put this much work into the room.

And I swear to you, if you put no primer and paint on that new wall, once it is cured, and lime paint finish it. You will be the envy of any who visit and ask how you did it.

Last edited by user1007; 07-31-2013 at 07:12 PM.
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Old 07-31-2013, 07:21 PM   #10
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cure plaster if covering if with a layer of joint compound before paint?


Cause I'm a minimalist and don't like tacky crap like Venetian plaster.
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Old 07-31-2013, 08:21 PM   #11
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cure plaster if covering if with a layer of joint compound before paint?


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Cause I'm a minimalist and don't like tacky crap like Venetian plaster.
Hugh? I still don't get where you are going.

Tacky crap, in my opinion, over a nice plastered wall would be powdered gypsum---aka drywall mud.

Real Venetian plaster is---guest what---plaster like you already said you trowled on and real fine marble dust. Like the stuff Venice or Florence sculpture was made of. You can polish it to a sheen like you would not believe.

You cannot, ever, polish the gypsum in drywal mud. I did search and found Home Desperate, Martha Stewart and other conventional references to Americanized Venetian Plaster. None are anywhere close. I have national food critics as friend and will bring dinner and cook for you and family if you at least read this...

http://www.venetianplastermasters.co...r_history.html

Home desparate and Blowe's does not sell it. Martha Stewart has never troweled it on or polished the real stuff.

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Old 08-01-2013, 02:37 AM   #12
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cure plaster if covering if with a layer of joint compound before paint?


I guess I am missing something also. In all the thousands of houses I have worked in with lime plaster walls, they were smooth as a babies butt. Drywall? not so much.
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Old 08-01-2013, 08:27 AM   #13
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cure plaster if covering if with a layer of joint compound before paint?


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I guess I am missing something also. In all the thousands of houses I have worked in with lime plaster walls, they were smooth as a babies butt. Drywall? not so much.
I love it when you quote Joe C!
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Old 08-01-2013, 01:49 PM   #14
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cure plaster if covering if with a layer of joint compound before paint?


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I guess I am missing something also. In all the thousands of houses I have worked in with lime plaster walls, they were smooth as a babies butt. Drywall? not so much.
Interesting, mine is just a little smoother than stucco, even though I use extra lime and super fine sand in the finish layer.
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Old 08-01-2013, 02:28 PM   #15
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cure plaster if covering if with a layer of joint compound before paint?


I don't know how much you can tell from a pic but here is one. Left of the line is just plaster with no joint compound, right is with joint compound.

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