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Plaster Mantel Repair

 
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Old 04-26-2019, 07:26 AM   #1
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Plaster Mantel Repair


I need to repair a plaster mantel column with a sizeable missing chunk (errant hammer strike) on an outside corner. Anybody know the basic steps of this kind of repair? I need to fill the area, maybe carve or sand it it to make it seamless, etc.

Thanks.
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Old 04-26-2019, 07:33 AM   #2
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Re: Plaster Mantel Repair


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Originally Posted by MarkJames View Post
I need to repair a plaster mantel column with a sizeable missing chunk (errant hammer strike) on an outside corner. Anybody know the basic steps of this kind of repair? I need to fill the area, maybe carve or sand it it to make it seamless, etc.



Thanks.
Not an expert, but I would suggest using a form, if possible. I am not sure how easily you can sand plaster once it hardens. If painted, you could probably use Bondo, which is an automotive epoxy filler that is sandable. Good luck!

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Old 04-26-2019, 07:39 AM   #3
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Re: Plaster Mantel Repair


Plaster is good for patching plaster.

"This remarkable material is stored as a powder, and is mixed with ordinary water into a liquid that gets gradually thicker and thicker until it becomes plastic, then a paste, then a cheese-bodied mass; finally turning rock hard in about an hour. Unlike practically any other compound, when plaster turns from liquid to solid it does not shrink, rather, it expands ever so slightly as it forms crystals. It can be carved, sanded, drilled, cut, textured, added to, reinforced and remain incredibly strong throughout."

https://juxtamorph.com/the-plaster-f...-with-plaster/
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Old 04-26-2019, 07:52 AM   #4
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Re: Plaster Mantel Repair


Thanks. I guess it works like easysand, etc. as it sets up. I'll experiment. Do you think I need a bonding primer, or just wet the surface...or nothing?

I tried to watch some ornamental plaster vids, but they're big productions, yet light on the fact details. Interesting that folks repair religious statues and all kinds of stuff, though.
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Old 04-26-2019, 08:21 AM   #5
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Re: Plaster Mantel Repair


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Thanks. I guess it works like easysand, etc. as it sets up. I'll experiment. Do you think I need a bonding primer, or just wet the surface...or nothing?

I tried to watch some ornamental plaster vids, but they're big productions, yet light on the fact details. Interesting that folks repair religious statues and all kinds of stuff, though.
If it is a clean wound, I personally don't think you do.

Plaster is old world and an amazing invention.

Sh!t does get a little hot as it cooks off, especially when its in a confined mass that's like a sphere or cube.

I visualize a hunk slightly larger than a hammer head got blown off. Should be an easy fix.

Go to craft shop and get some fresh stuff. So little demand, anybody that has some on the shelf - likely older than Methuselah.
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Old 04-26-2019, 09:37 AM   #6
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Re: Plaster Mantel Repair


Upon closer inspection, it's some sort of cast concrete (fine, grey aggregate) with a plaster skim. Outside corner about 7" high x 1" x 1" or so.
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Old 04-26-2019, 09:43 AM   #7
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Re: Plaster Mantel Repair


Thatís probably plaster too, just with sand in it for the brown coat .

I would dampen the surface to be repaired with water to keep it from sucking the joint dry , then just fill it with plaster. Use multiple coats if it doesnít want to fill up in one.
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Old 04-26-2019, 11:09 AM   #8
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Re: Plaster Mantel Repair


Plaster.

Mount guide rails above and below where you patch, butting against the area to be patched.

Cut profile into the edge of a trowel or any stiff, flat piece of steel. It's made to run along the guides. Place the plaster, and strike it off with the profile tool.

You can use a wood profile, it will just be a little more porous on the surface of the plaster.
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Old 04-26-2019, 06:52 PM   #9
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Re: Plaster Mantel Repair


Does it look something like this?
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Old 04-26-2019, 06:56 PM   #10
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Re: Plaster Mantel Repair


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Does it look something like this?
Ours is not as plain as that one.
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Old 04-26-2019, 07:28 PM   #11
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Re: Plaster Mantel Repair


If it's ornate, so you can't just run a profile, you have to make mold.
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Old 04-26-2019, 07:52 PM   #12
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Re: Plaster Mantel Repair


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If it's ornate, so you can't just run a profile, you have to make mold.
Nah, ours is simple. A profile would probably work.
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Old 04-26-2019, 09:07 PM   #13
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Re: Plaster Mantel Repair


Resta could tell you how to fix it.
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Old 05-09-2019, 07:25 AM   #14
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Re: Plaster Mantel Repair


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Originally Posted by hdavis View Post
If it's ornate, so you can't just run a profile, you have to make mold.
Easy to do, slight bit of plaster weld then apply plaster and run profile across. I usually use patching plaster because it is what my lumber yard carries

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