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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Description

🎨 Craft Your Vision with Flex Foam-iT! III!

QUICK AND EASY SETUP - Mix ratio of 1:2 by volume for hassle-free preparation.
LIGHTWEIGHT AND STRONG - Lowest density foam that doesn't compromise on strength.
TEST BEFORE YOU CREATE - Perform small-scale tests to ensure compatibility with your materials.
VERSATILE APPLICATIONS - Perfect for props, gaskets, and custom padding—your imagination is the limit!
UNLEASH YOUR CREATIVITY - Transform your ideas into reality with premium flexible foam!

Flex Foam-iT! III is a high-grade, water-blown liquid expanding foam designed for a variety of applications, including special effects, industrial uses, and arts & crafts. This versatile foam cures to a solid, flexible form in just 2 hours, making it ideal for creating props, custom padding, and more. With a mix ratio of 1:2 by volume, it offers the lowest density and maximum expansion in its series, ensuring you get the most out of your creative projects.

Specifications

Brand	Smooth-On
Specific Uses For Product	Art
Material	Polyurethane
Compatible Material	Vinyl
Item Form	Foam
Special Feature	Strong
Colour	Clear
Item Package Quantity	1
Package Information	Bottle
Item Volume	2.8 Litres
Viscosity	1,000 cps
Full Cure Time	2 Hours
Water Resistance Level	Not Water Resistant
Net Quantity	1.0 count
UPC	751635446410
Manufacturer	Smooth-On, Inc.
Country of Origin	USA
Model number	SOFF3
Number of Memory Sticks	1
Item Weight	1 kg 130 g
Product Dimensions	20.32 x 20.32 x 15.24 cm; 1.13 kg
Item model number	SOFF3
Item Height	6 Inches
Item Width	8 Inches
Compatible Device	Schaumstoff
Are batteries included?	No

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