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787 32-Ounce Casting' Craft Mold Builder, Natural Latex Rubber

4.3 4.3 out of 5 stars 160 ratings
  • 32-Ounce
  • Clean up Mold Builder with cold soapy water only
  • Flexible and stretchable
  • Duplicate many objects
  • Molds may be reused many times

Product information

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Environmental Technology 787 32-Ounce Casting' Craft Mold Builder, Natural Latex Rubber

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Product Description

Mold builder is a natural latex rubber that is quick drying, economical to use, peels easily from model, flexible and stretchable, harmless to most surfaces. Now you can duplicate figurines, sculptures and other items with safe, brushable latex rubber. Mold builder will not stick to metal, clay, ceramics, plaster, wood, or plasticine clay. Mold builder molds are durable, reusable, and economical to make. The molds you make from mold builder can be used to cast paper, plaster, candle wax, soap, casting resin or casting epoxy.

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Customer reviews

4.3 out of 5 stars
4.3 out of 5
160 global ratings

Customers say

Customers like the quality, ease of use, value, moldability and detail of the product. They mention that it's a great product to work with, it'll make good substantial molds capturing super fine details. They are also satisfied with messiness. However, some customers dislike the smell.

AI-generated from the text of customer reviews

35 customers mention30 positive5 negative

Customers like the quality of the product. They say it makes for good, substantial molds capturing, is reliable, and easy to use. They also say it's a great product to work with, and useful. Some customers mention that it worked great for invention convention projects, and are pleasantly surprised with the results.

"...It is not watery,nor is it super thick. I'm pleasantly surprised with the results, and I've made molds for branches that were..." Read more

"...though it's not as fast as making molds using 1-1 RTV material, it's durability and simplicity and economy makes a good companion resource in..." Read more

"...It was exactly as I expected.I like it because it builds fast and strong...." Read more

"...Making a negative mold to support the mold helps it hold shape. Works well, just try not to eat too much of it." Read more

19 customers mention15 positive4 negative

Customers find the product easy to work with. They mention that it's a good model making compound, has good instructions, and is simple and economical.

"This is really easy to work with. It makes great molds, it doesn't stain and it peels right off any surfaces it wasn't intended to get on...." Read more

"...as fast as making molds using 1-1 RTV material, it's durability and simplicity and economy makes a good companion resource in addition to using RTV..." Read more

"...It is easier overall to use, does not take as much time, cures stronger. Better fit for me personally." Read more

"...I will take some pictures and display later. The Mold is really easy to use." Read more

9 customers mention9 positive0 negative

Customers appreciate the value of the product. They mention it works well, is affordable, and does the job at a reasonable price. Some say it's a good companion resource and a cost effective way to make molds.

"...You can make numerous molds with this one jar making it a cost effective way to make molds. More so than silicone." Read more

"...Glad I found it and price was good too . Way to go Amazon" Read more

"...1-1 RTV material, it's durability and simplicity and economy makes a good companion resource in addition to using RTV materials..I use both..." Read more

"Great product, great price!! It's quick drying in thin layers, easy to peel off, and dries an off white/yellow so you know what areas are covered...." Read more

8 customers mention6 positive2 negative

Customers like the moldability of the product. For example, they say it's ideal for making molds, doesn't stain, and peels right off any surfaces. Some mention that the paint-on mold builder is fine, but they can't think of an application where it'd be useful.

"This is really easy to work with. It makes great molds, it doesn't stain and it peels right off any surfaces it wasn't intended to get on...." Read more

"This mold builder is great!..." Read more

"...It is more like a mold making latex, just about as rubbery. I tried to add a filler from Cementex but to no avail. It remained rubbery...." Read more

"...and, while it takes some patience and getting used to, it is ideal for making molds...." Read more

5 customers mention5 positive0 negative

Customers are satisfied with the detail of the product. They mention that it is very good at picking out details in the original model, making substantial molds that capture super fine details.

"...The compound is very good at picking out details in the original model.The process takes a while...." Read more

"...The sculpt was highly detailed and the mold worked perfectly. It takes time and patience, but it works...." Read more

"...Liquid Latex picks up EVERY DETAIL!! perfectly." Read more

"...need a bit more care, but it makes for good, substantial molds capturing super fine details. So far, so good!" Read more

5 customers mention5 positive0 negative

Customers find the product easy to work with and clean up is a breeze. They also say it makes great molds and doesn't stain.

"...The clean-up is a snap. I generally add a smidgen of ammonia to the water to clean out the brushes and the area where you are casting." Read more

"This is really easy to work with. It makes great molds, it doesn't stain and it peels right off any surfaces it wasn't intended to get on...." Read more

"I've been using this product for years. Durable, easy to use and cleans up with water (if washed off before it vulcanizes of course)." Read more

"...Worked great. Easy to use and not messy. Recommend it to anyone needing a quick casting mold." Read more

5 customers mention5 positive0 negative

Customers find the latex sheet versatile and useful for watercolor art, paleo work, and makeup application. They also mention that it looks great.

"...It peeled right off the sculpt and looked great...." Read more

"Great latex, at a very competitive price...." Read more

"Great for makeup application" Read more

"Very nice for paleo work..." Read more

5 customers mention0 positive5 negative

Customers are dissatisfied with the smell of the product. They mention that it smells strongly like ammonia and like it's toxic.

"...This stuff is not only messy and smells SO strongly of ammonia, its also very time consuming...." Read more

"...Puts off ammonia smell as it's drying but nothing to bad if in open area...." Read more

"...It also smells strongly like ammonia...." Read more

"...I make molds of my pottery sculptures with it. Smells terrible but it’s changed my business!!" Read more

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Top reviews from the United States

Yusuf Zahri
5.0 out of 5 stars Good, reliable, easy to use model making compound
Reviewed in the United States on August 22, 2015
Verified Purchase
I use this product all the time.

It is an air dry rubber compound that covers items that you want to make cast copies of.

So, if you have a small clay figure that you would like to make multiple copies of in plaster, you can use this compound to cover it, dry, and then be used as a plaster mold.

The compound is very good at picking out details in the original model.

The process takes a while. I work a full-time job, and, when producing castings, I usually try to put a coat on in the morning and then just before bed. To cover an item the size of a small figurine, it usually takes me 5-7 days of application.

The first few coats are the most important as it is important to cover the complete surface of the item that you are trying to copy.

The clean-up is a snap. I generally add a smidgen of ammonia to the water to clean out the brushes and the area where you are casting.
5 people found this helpful
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Ko-Rho Fett
5.0 out of 5 stars Worked perfectly, very happy!
Reviewed in the United States on August 25, 2014
Verified Purchase
This worked perfectly for my project. The latex was brushed over my clay sculpt one layer at a time every hour. I placed a fan and a light over it to help speed up drying. I applied 13 layers and let that sit for approximately 32 hours. It peeled right off the sculpt and looked great. I set it in a bowl of flour for support and poured in my resin mix and 15 minutes later had a perfect plastic replica of my sculpt. The latex mold held up for 3 more pours before it was unusable due to tearing. The sculpt was highly detailed and the mold worked perfectly. It takes time and patience, but it works. I'm new at this stuff and was highly skeptical, not anymore.
4 people found this helpful
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SFO Bro
4.0 out of 5 stars Appears to be what I was looking for.
Reviewed in the United States on December 27, 2014
Verified Purchase
I read that it might take up to 10 coats for some items. Depending on your mold, it could take 30 coats.
I don't have a problem with that, and frankly I wouldn't want to change the viscosity. It is not watery,
nor is it super thick. I'm pleasantly surprised with the results, and I've made molds for branches that were
less than 1/8" wide, as well as from garden rocks over 10". I will absolutely buy more when I run out.
3 people found this helpful
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Shannon Brennan
5.0 out of 5 stars Great product to work with.
Reviewed in the United States on August 29, 2016
Verified Purchase
This is really easy to work with. It makes great molds, it doesn't stain and it peels right off any surfaces it wasn't intended to get on. Including your hands. I'm a fan.

You can make numerous molds with this one jar making it a cost effective way to make molds. More so than silicone.
2 people found this helpful
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flygirl
5.0 out of 5 stars Found it on Amazon of course⭐️⭐️⭐️⭐️⭐️
Reviewed in the United States on November 22, 2023
Verified Purchase
Couldn’t find this in any arts and crafts store so of course Amazon had it. Been using it for years to make items for my Christmas Wreaths. Glad I found it and price was good too . Way to go Amazon
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Aaron S.
3.0 out of 5 stars It works but..
Reviewed in the United States on April 13, 2013
Verified Purchase
the layers are to thin. I used 5 layers and was not happy with the results. I was only building a model of about 2 inches or less, but needed 5 more layers OR more for the thickness needed. I also used a plaster mold around the rubber mold and it was still not enough.
3 people found this helpful
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Alex Lopez
5.0 out of 5 stars I love this for casting resin for plastic model parts.
Reviewed in the United States on July 4, 2010
Verified Purchase
HIGHLY recommended for brush on mold making. i build up brush on layers on small plastic parts to make duplicate parts for my plastic models. though it's not as fast as making molds using 1-1 RTV material, it's durability and simplicity and economy makes a good companion resource in addition to using RTV materials..I use both dependent on needs/parts type. Liquid Latex picks up EVERY DETAIL!! perfectly.
11 people found this helpful
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Rex
1.0 out of 5 stars Rubber like result.
Reviewed in the United States on July 31, 2018
Verified Purchase
This supposedly replaces the old casting latex used to make mannequins, puppets, doll heads, etc. It is more like a mold making latex, just about as rubbery. I tried to add a filler from Cementex but to no avail. It remained rubbery. Good for making flexible puppets, not for rigid products.
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