Will this stick/adhere to polymer, like a gun stock for example?

Yes it sticks to just about everything as long as you rough up the surface and remove oils and grease with alcohol or an equivalent degreaser.

Does it work and stick to styrofoam - if not what type of material needs to be on the Styrofoam to work well?

I'm not sure but you can do an experiment with a little piece of it. Try watered down wood glue and paint the Styrofoam. That usually works with getting oil based clay's to stick to Styrofoam. Of course let the wood glue dry before putting on the epoxy. I don't see why that won't work. Or if it doesn't you can wrap it in aluminum but I think that might be more trickier to work with... secure with thin floral wire perhaps. I hope this helps.

How does this compare to aves apoxie sculpt and magic epoxy sculpt?

I've work with Magic Epoxy Sculpt and Aves Apoxie Sculpt. Those are much better to work with the Sculpt Epoxy Putty is like sculpting with gum it is very hard to work with or perhaps I don't have the patience with using it but I don't like it. The others are better in my opinion.

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Free Form Sculpt - High Density Epoxy Dough-Crystalline Silica Free - Trial Unit

Free Form Sculpt - High Density Epoxy Dough-Crystalline Silica Free - Trial Unit

Product ID: 15420566

Details

Age Range (Description)
Adult
Brand
Smooth-On
Color
Grey
Included Components
Clay
Item dimensions L x W x H
4.7 x 4.6 x
Material
Resin

⏳1.5 hours working time

💧Waterproof & cures underwater

⚖️30% lighter than competitors

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Description

🎨 Sculpt smarter, not harder — the lightweight epoxy revolution!

SAFE SOUND - Crystalline silica-free for worry-free sanding and shaping.
COLOR YOUR VISION - Easily tint with SO-Strong colors or paint after curing for custom finishes.
WORK AT YOUR PACE - Generous 1.5-hour working time means no rush, perfect for detailed creativity.
NO FIRING NO FUSS - Self-curing epoxy clay hardens overnight—no kiln or heat needed.
LIGHT AS AIR STRONG AS STEEL - 30% lighter formula lets you sculpt bigger, hold verticals effortlessly.

Free Form Sculpt is a high-density, two-part epoxy clay that self-cures without firing, achieving a hard, durable, and waterproof finish with virtually no shrinkage. It’s 30% lighter than similar products, offers a long 1.5-hour working time, and is free of carcinogenic crystalline silica. Easily colored or painted, it bonds to multiple surfaces and even cures underwater, making it ideal for professional sculptors and modelers seeking precision and safety.

Specifications

ASIN	B00IAZYHTW
Age Range Description	Adult
Best Sellers Rank	#93,777 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #115 in Sculpture Modeling Compounds
Brand Name	Smooth-On
Color	Grey
Customer Reviews	4.2 4.2 out of 5 stars (91)
Included Components	Clay
Item Dimensions	4.7 x 4.6 x 9.1 inches
Manufacturer	Smooth-On, Inc.
Manufacturer Part Number	55741
Material Type	Resin
Model Number	55741
Number of Items	1
Other Special Features of the Product	Waterproof
Recommended Uses For Product	Modeling
UPC	751635557413
Unit Count	1.0 Count

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VT21654

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