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Dark Knight
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Registered: 04-2008
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Molding tips, sealing sculpts and plaster use.


Hey guys, I have a quick question for you. I just recieved my gypsum cement and latex today, and want to start casting what I can right away.

My question is, do I need a release agent for the sculpt? Also, do I need to "seal" the sculpt. I want to preserve my sculpts.

I have one 50Lb bag of ]gypsum cement (Ultra Cal 30) and 5 gallons of ]RD-407 Latex.


Last edited by TheKingaSwing, 3/7/2011, 9:39 am


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10/17/2008, 3:05 pm Link to this post Send Email to Mr Justin   Send PM to Mr Justin
 
bat texan Profile
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Caped Crusader
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Re: Molding Question:


I'd spray your sculpt with Krylon acrylic spray; some guys like the clear, I use black. Do several coats, and let it dry for a few days before casting.

You're using the same stuff I've used, so you're on the right track. As far as preserving your sculpt, that depends on what it is, and how many undercuts there are. Of all the things I've sculpted, the only one that came out of the mold relatively intact were my fins for my gauntlets. All the rest were destroyed getting them out of the mold. What are you casting, by the way?

If you were using silicone rubber to make a mold off of your sculpt, you'd have a better chance of saving the sculpt. Maybe someone else will chime in with more help. emoticon

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10/17/2008, 3:27 pm Link to this post Send Email to bat texan   Send PM to bat texan
 
BelmontBat Profile
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Keeper of the Cave
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Re: Molding Question:


Make sure to use a proper mixing ratio for the ultracal, too. I know lots of guys who "eyeball it." But, I go by the maker's instructions on it.

I just googled it and it's 38:100 water to ultracal.

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Mr Justin Profile
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Dark Knight
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Re: Molding Question:


Quote:

bat texan wrote:

I'd spray your sculpt with Krylon acrylic spray; some guys like the clear, I use black. Do several coats, and let it dry for a few days before casting.

You're using the same stuff I've used, so you're on the right track. As far as preserving your sculpt, that depends on what it is, and how many undercuts there are. Of all the things I've sculpted, the only one that came out of the mold relatively intact were my fins for my gauntlets. All the rest were destroyed getting them out of the mold. What are you casting, by the way?

If you were using silicone rubber to make a mold off of your sculpt, you'd have a better chance of saving the sculpt. Maybe someone else will chime in with more help. emoticon



Thank's bro! I'm going to be casting my chest piece, abdomial pieces, shoulder (2 times), and the rest of the armor. First up will be my chest piece though.

Thanks for your response Bat Texan. I was hoping you'd see this because I know you're very familiar with the Monster Makers products. Thanks!

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Mr Justin Profile
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Dark Knight
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Re: Molding Question:


Quote:

BelmontBat wrote:

Make sure to use a proper mixing ratio for the ultracal, too. I know lots of guys who "eyeball it." But, I go by the maker's instructions on it.

I just googled it and it's 38:100 water to ultracal.



Thank you! I was worried about that as well, and was gonna read up on that. Pretty freaky stuff too. It says on the bag that it causes a reaction that generates a LOT of heat when mixed with water. I was wondering, how do I go applying this stuff to my sculpt without getting burned? emoticon

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The Kreator Profile
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Sidekick
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Re: Molding Question:


The heat generated is when the cement begins to harden. From my experience with it, admittedly not nearly as much as others here, it doesn't create burning heat, just warm to the touch.

For example, my whole face was molded in the stuff recently. The warmth actually felt kind of nice. :)

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10/17/2008, 4:19 pm Link to this post Send Email to The Kreator   Send PM to The Kreator
 
Mr Justin Profile
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Dark Knight
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Re: Molding Question:


Quote:

The Kreator wrote:

The heat generated is when the cement begins to harden. From my experience with it, admittedly not nearly as much as others here, it doesn't create burning heat, just warm to the touch.

For example, my whole face was molded in the stuff recently. The warmth actually felt kind of nice. :)

--Log in or sign up to see linked image content--



Whoa, is that the same stuff I'm using?

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10/17/2008, 5:29 pm Link to this post Send Email to Mr Justin   Send PM to Mr Justin
 
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Sidekick
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Re: Molding Question:


Quote:

Mr Justin wrote:

Quote:

The Kreator wrote:

The heat generated is when the cement begins to harden. From my experience with it, admittedly not nearly as much as others here, it doesn't create burning heat, just warm to the touch.

For example, my whole face was molded in the stuff recently. The warmth actually felt kind of nice. :)

--Log in or sign up to see linked image content--



Whoa, is that the same stuff I'm using?




Well, I'm pretty sure she was using something cheaper than actual ultracal. It was slightly different texture than the ultracal I use for molding.

But the heat thing is just part of the chemical reaction that helps set the mold. Even when working with larger quantities, I've not had it heat up more than warm to the touch. Resin does the same thing as it cures.


Side Note:
The one time I did get burned, was after heating up some oil based clay and not realizing how hot it had gotten... The stuff was like a melty chocolate bar, and at that point, it just kept burning and you can't get it off your hand too easy. :cussing

Now I just use a heat gun for that, rather than microwave or oven unless it's a large brick of the stuff.

Last edited by The Kreator, 10/17/2008, 5:50 pm


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-David
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Mr Justin Profile
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Dark Knight
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Re: Molding Question:


Yeah, burning yourself isn't fun. I've got a nice burn on my arm from work.

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Keeper of the Cave
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Re: Molding Question:


The colder the water, the longer it's going to take to set up, too. Keep that in mind, but work fast.

Most folks do two or three splash coats. I'm kind of anal and will do four or five. I've had too many things crack getting the molds open.

Then two or three burlap reinforced coats.

I know others use different techniques. This is just what works for me.

Good luck!

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Howdy.
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