ultra cal 30 mold making question

Brickxar

New Member

• Feb 21, 2017

• #1

Hi,
i'm working a full head mask that i'll make out of latex with the mold made of ultra cal 30 and i have a few questions.
1. is there a cheaper plaster then ultra cal 30 that works as well?
1. how much plaster will i need for a 2 part mold?


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cckaiser2

Well-Known Member

RPF PREMIUM MEMBER

• Feb 21, 2017

• #2

I bought mine from Reynolds and they said a full bag and a half is typical for a full head mask with burlap.


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A

ausf

Active Member

• Feb 21, 2017

• #3

UltraCal is great for latex use because it is strong, has very little shrinkage and can be used for vulcanizing if necessary. HydroCal is lighter, weaker and isn't as accurate once it gives up it's moisture.

Depending on where you live, you can check Sculpture or Ceramic Supply houses, since they usually carry Pottery plaster and HydroCal, you might find Ultra or they'll get it for you.

The other option is a good contractor supply (not Home Depot type) that carries USG products, check with their distributor list.

The price is high because of shipping, you can probably score an 80lbs bag of the stuff for $30 if you can go pick it up. I remember buying the stuff from Earth Materials for about $10 a bag (talking a long time ago).

 

PropReplicator2

Master Member

RPF PREMIUM MEMBER

• Feb 21, 2017

• #4

UltraCal is very nice for the price. As ausf said, the price is high because of shipping. To pick it up straight from the source, it would be a lot cheaper.

 

Brickxar

New Member

• Feb 22, 2017

• #5

Okay cool, i found a pottery supply store that sells it.


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Brickxar

New Member

• Feb 22, 2017

• #6

sorry for asking another question, but is two quarts enough to do a full head mask?


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A

ausf

Active Member

• Feb 22, 2017

• #7

Bags man, bags.

For a full head, you're probably going to want to go close to 2 inches thick with burlap in there. I've never actually worked out how much like you would do with silicone, etc, because I'd usually have a large amount on hand, but I wouldn't even start a full head without a 50 lb bag ready and that might be pushing it.

 

Brickxar

New Member

• Feb 22, 2017

• #8

i meant for latex sorry


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Brickxar

New Member

• Feb 22, 2017

• #9

would 2 quarts of latex be enough for a full head mask to only goes half way down the neck


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M

Moviepropmaker6

Active Member

• Feb 24, 2017

• #10

Brickxar said:

would 2 quarts of latex be enough for a full head mask to only goes half way down the neck

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Click to expand...

Depends on the method you plan on using to cast. If you're going to be slush casting then 2 quarts will be more than enough, but if you're going to be using the method(i forget what it's called) that involves filling your mold to the rim with latex and letting it sit until it forms a 2-3mm skin (45-60 min) inside the mold then you'll probably need at least a gallon, if not several.

 

Brickxar

New Member

• Feb 25, 2017

• #11

thanks, one more question i just made the mold and it has some bubbles and a big seam. can i use monster makers clay to cover this up, or should i mix a little ultra cal to fill the areas.


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