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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Smooth-On FlexFoam-iT!™ III Flexible Urethane Foam, Casting Foam for Props, Gaskets, & More - Pint Unit

Product ID: 2325709

Details

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

⏳Fast 2-hour cure time

🔄1:2 mix ratio, easy pour

⚖️Low density, ultra-light foam

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$111.32

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Description

⚡ Expand your creativity with the fastest, lightest flexible foam on the market!

RAPID 2 HOUR CURE - Get your projects moving fast with a quick solidification time that keeps your workflow seamless.
PRECISION POURABILITY - Optimized 1:2 mix ratio ensures smooth, consistent pouring for flawless casting every time.
VERSATILE CREATIVE POWER - Perfect for props, industrial gaskets, custom padding, and more—unleash your professional craft potential.
TRUSTED INDUSTRY STANDARD - Backed by Smooth-On’s reputation and 4.6-star rating from 700+ users, join the community of makers who demand quality.
ULTRA LIGHTWEIGHT EXPANSION - Experience the lowest density foam in the FlexFoam-iT! series for maximum volume with minimal weight.

Smooth-On FlexFoam-iT!™ III is a premium, water-blown flexible urethane foam designed for professional-grade casting applications. With its industry-leading low density and rapid 2-hour cure time, this pint-sized kit offers a 1:2 mix ratio for easy pouring and reliable results. Ideal for creating props, gaskets, and custom foam padding, it combines versatility with proven performance, making it a top choice for artists and industrial users alike.

Specifications

ASIN	B00I6LYDE4
Best Sellers Rank	#43,997 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #399 in Sculpture Molding & Casting Products
Brand Name	Smooth-On
Color	Clear
Compatible Material	Foam
Container Type	Pint
Customer Reviews	4.6 4.6 out of 5 stars (722)
Full Cure Time	2 Hours
Item Form	Liquid
Item Package Quantity	1
Item Weight	2.49 Pounds
Manufacturer	Smooth-On, Inc.
Material Type	Polyurethane
Model	SOFF3
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 Milliliters
Water Resistance Level	Not Water Resistant

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