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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Flex Foam-iT! III Flexible Polyurethane Foam - Trial Unit

Flex Foam-iT! III Flexible Polyurethane Foam - Trial Unit

Product ID: 376690457

Details

Brand
Smooth-On
Item Form
Liquid
Material
Polyurethane
Special Feature
Fast Drying
Specific Uses For Product
Art

⏳2-hour cure time

🔄1:2 mix ratio

⚖️15x volume expansion

€ 178.38

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Description

⚡ Expand your creativity, not your wait time!

RAPID 2 HOUR CURE - Get solid, flexible foam fast—perfect for tight project deadlines.
PRECISION MIX RATIO - Easy 1:2 volume mix ensures consistent, reliable results every time.
PRO GRADE FLEXIBILITY - Premium water-blown polyurethane foam that balances durability with softness.
VERSATILE CREATIVE CANVAS - Ideal for props, custom padding, industrial gaskets, and arts & crafts projects.
ULTRA LIGHT EXPANSION POWER - Expands up to 15 times its original volume for maximum creative freedom.

FlexFoam-iT! III is a premium, water-blown flexible polyurethane foam that expands 15x its original volume. With a quick 2-hour cure time and a simple 1:2 mix ratio, it delivers lightweight, durable, and flexible foam ideal for special effects, props, custom padding, and industrial applications. Trusted by creatives and professionals alike for fast, reliable results.

Specifications

ASIN	B00I6LYDE4
Best Sellers Rank	#1,060,728 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #194 in Sculpture Modeling Compounds
Brand Name	Smooth-On
Colour	Clear
Compatible Material	Vinyl
Container Type	Bottle
Country of Publication	USA
Customer Reviews	4.5 4.5 out of 5 stars (705)
Item Form	Liquid
Item Package Quantity	1
Item Weight	2.49 Pounds
Manufacturer	Smooth-On, Inc.
Manufacturer Part Number	44644
Material Type	Polyurethane
Model	SOFF3
Number of Pieces	2
Other Special Features of the Product	Fast Drying
Specific Uses For Product	Art
UPC	751635446410
Unit Count	1.0 Count
Viscosity Level	Low
Volume	473.18 Millilitres
Water Resistance Level	Not Water Resistant

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

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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€ 178.38

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered 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 Austria.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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