Can i use with plastic? or do i need a release agent?

Urethane foams are adhesive and will stick / bond to many surfaces. We recommend Ease Release™ 2831 to release urethane foam from most surfaces. If the release application is particularly difficult (example; releasing urethane foam from urethane rubber), we recommend an application of Universal Mold Release™ followed by an application of Ease Release™ 2831. WARNING; Do not use Universal Mold Release by itself, or any other silicone based release agents. This will collapse the foam. You MUST perform a small scale test to determine if the release agent you use will work properly with the plastic you are casting against.

Would this work well for filling a plaster body cast intended to make a dress form for sewing?

I thinking would. It is pretty "squishy " so if that's okay with you then I think it would work well.

Hi, do you also have smooth on flex foamV or 6?

I am not Amazon and I have not worked with 6 (Pillow soft) but I have a sample of it. The Smooth-On web site says they make sample kits for both products and they are both similar to 3 in that they are measured by volume. The big difference is that they expand less.

What is the Shore hardness of the resultant foam?

I could not find a Shore Hardness for the Foam (and yes, I know what I was looking for) but since it is their most expansive foam I imagine the number to be quite low. I am not even Shore Hardness applies to foams.

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FlexFoam-iT! III Flexible Urethane Foam, Casting Foam, Pint Unit | For Props, Gaskets, & More

Product ID: 2325709

Details

Brand
Smooth-On
Item Form
Liquid
Material
Polyurethane
Special Feature
Strong
Specific Uses For Product
Craft

⏳2-hour full cure time

🔄1:2 mix ratio by volume

⚖️Lowest density in series

$117.44

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Expand your creativity with the lightest, fastest-curing flexible foam!

PRECISION POURABILITY - Optimized 1:2 mix ratio ensures smooth, consistent pouring for flawless props, gaskets, and custom padding.
FAST FLEXIBLE CURING - Achieve solid, flexible foam in just 2 hours—perfect for tight project deadlines and rapid prototyping.
ULTRA LIGHT EXPANSION POWER - Experience the highest expansion foam in the FlexFoam-iT! lineup for maximum volume with minimal weight.
TRUSTED BY CREATORS MAKERS - Join 700+ satisfied users who rate it 4.5 stars for reliability and performance in arts, crafts, and industrial projects.
VERSATILE CREATIVE INDUSTRIAL USE - From intricate special effects to durable industrial gaskets, this foam adapts seamlessly to your professional needs.

Smooth-On FlexFoam-iT! III is a premium, water-blown flexible urethane foam with the lowest density and highest expansion in its series. It cures to a solid, flexible form in 2 hours with a precise 1:2 mix ratio, making it ideal for professional-grade props, industrial gaskets, and custom foam padding. Trusted by thousands of creators, it delivers reliable, versatile performance for both artistic and industrial applications.

Specifications

ASIN	B00I6LYDE4
Best Sellers Rank	#50,063 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #424 in Sculpture Molding & Casting Products
Brand Name	Smooth-On
Color	Clear
Compatible Material	Foam
Container Type	Pint
Customer Reviews	4.5 4.5 out of 5 stars (724)
Full Cure Time	2 hours
Item Form	Liquid
Item Package Quantity	1
Item Weight	2.5 pounds
Manufacturer	Smooth-On, Inc.
Material Type	Polyurethane
Model	SOFF3
Number of Pieces	2
Other Special Features of the Product	Strong
Part Number	44644
Specific Uses For Product	Craft
UPC	751635446410
Unit Count	44.16 Ounce
Viscosity Level	Medium
Volume	473.18 ml
Water Resistance Level	Not Water Resistant

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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$117.44

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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