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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Smooth-On Free Form Sculpt High Density Epoxy Dough, 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 hr working time

🧱No shrinkage, ultra-hard cure

⚖️30% lighter than competitors

732 Lei

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Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎨 Sculpt your vision—light, strong, and ready to wow overnight!

SAFE VERSATILE BONDING - No carcinogenic silica; bonds to wood, metal, glass, stone, and even cures underwater.
LIGHTWEIGHT YET ROCK SOLID - 30% lighter formula supports vertical builds without sagging or cracking.
CUSTOM COLORS MARBLE EFFECTS - Mix in SO-Strong tints for personalized hues or stunning marble finishes.
PRECISION DETAILING MADE EASY - Ultra-fine particles let you carve intricate textures with unmatched control.
EFFORTLESS SCULPTING ZERO FIRING - Two-part epoxy clay that self-cures overnight—no kiln needed, no hassle.

Smooth-On Free Form Sculpt is a professional-grade, two-part epoxy clay that self-cures to a durable, waterproof finish without firing. It’s 30% lighter than similar products, enabling larger, more stable sculptures with fine detail precision. Easily tinted or painted, it bonds to multiple surfaces and is safe to use without carcinogenic silica, making it ideal for artists and modelers seeking high-performance sculpting material.

Specifications

Age Range Description	Adult
Asin	B00IAZYHTW
Best Sellers Rank	#150,706 in Arts, Crafts & Sewing (See Top 100 in Arts, Crafts & Sewing) #220 in Sculpture Modeling Compounds
Brand Name	Smooth-On
Color	Grey
Customer Reviews	4.2 4.2 out of 5 stars (93) 4.2 out of 5 stars
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	Sculpting
Unit Count	1 Count
Upc	751635557413

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732 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered 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 Romania.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

View all Trustpilot reviews