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reddkryten Profile
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Apprentice

Registered: 09-2003
Posts: 226
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Slowing Plaster Setting Time


This is kind of a dull question, but it's really annoying.

I was making a mold earlier, when I started I was being very precise, everything was perfect.

Then the plaster started setting, I gave up on precision and just started throwing the plaster at the sculpt.

So is there anything I can do to slow the setting time. I know cold water should slow it down but it didn't, the water was ice cold. It's winter here. It was so cold I lost feeling in my hands and the plaster only took a few minutes to set.

Thanks in advance.

Last edited by Deadly Lemur, 4/4/2006, 9:08 pm


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If I gotta get out that door, and you're standing in my way, one way or the other, you're gettin' outta my way.- Mr.Pink.
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daytonbatz Profile
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Dark Knight

Registered: 02-2004
Posts: 568
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Re: How can I slow down the setting time of plaster.


what type of plaster r u using bro?
1/20/2006, 1:43 pm Link to this post Send Email to daytonbatz   Send PM to daytonbatz
 
reddkryten Profile
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Apprentice

Registered: 09-2003
Posts: 226
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Re: How can I slow down the setting time of plaster.


Something called carlite finish.

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If I gotta get out that door, and you're standing in my way, one way or the other, you're gettin' outta my way.- Mr.Pink.
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efarrell4 Profile
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Head Administrator

Registered: 02-2004
Posts: 7501
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Re: How can I slow down the setting time of plaster.


My best suggestion would be to mix smaller batches and work quickly. The thing about most plasters, ultracal and hydrocal is that they are chemically cured. A reaction occurs when you mix in the water and you just can't stop it.

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Caped Crusader

Registered: 06-2004
Location: Under a full moon
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Re: How can I slow down the setting time of plaster.


Isn't it with Ultracal mixing in warm water speeds it up and cold slows it down? (or visa versa) I remember reading something like that years ago.
1/20/2006, 10:58 pm Link to this post Send Email to stampedemag   Send PM to stampedemag
 
efarrell4 Profile
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Head Administrator

Registered: 02-2004
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Re: How can I slow down the setting time of plaster.


That might help a little Rick but ultimately it's the chemical reaction that causes it to cure (harden) so though you could slow it down slightly by using cold water in the end once the thickening starts it's pretty much a matter of moments before what you have left in the mixing pail is unuseable. I usually lix a gallon, maybe a gallon and 1/2 at most at a time. I figure that's about all i can use before the hardening starts.

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1/21/2006, 11:11 am Link to this post  
 
DAVIDYR1 Profile
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Caped Crusader

Registered: 02-2004
Location: UD Replicas
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Re: How can I slow down the setting time of plaster.


Ed is right.
Ultracal or similar stones have a usual working time and set time. Using colder water will give you some extra time but it is in fact a chemical reaction that gets it to kick regardless of the water temperature.
Until you get comfortable with larger batches of material it's wise to use smaller amounts. The more you do the faster you will get and ultimately used to lager batches of mixed material.

David

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1/21/2006, 11:43 am Link to this post  
 
Brin Londo Profile
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Keeper of the Cave


Registered: 02-2004
Location: Mississippi
Posts: 9351
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Re: How can I slow down the setting time of plaster.


Get yourself some of the smaller plastic mixing buckets at Lowes or Home Depot. 1 gallon size will be fine.
And remember not to let your Ultra Cal start setting up before you apply your next layer, or you won't get good bond between layers.
Good luck.

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Proximo Profile
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Caped Crusader

Registered: 12-2004
Posts: 4384
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Re: How can I slow down the setting time of plaster.


Im not sure what the Brand i use is called, Its a simple stone plaster.

At the first layers of something big i always mix it whit ice cold water, it gives me about 5-10 minutes of time to brush the first layers on, Then when it starts to set up i just use my hands.
Not sure how to make it set slower, But what ive heard Cold water is the only way.

Last edited by Proximo, 1/21/2006, 3:29 pm
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artsee1 Profile
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Caped Crusader

Registered: 02-2004
Location: 14 Miles from The Real Batcave
Posts: 2409
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Re: How can I slow down the setting time of plaster.


Ed nailed it.

Paul

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