No, this is an oil based clay. It can be softened with heat but it will never harden like a Polymer clay. You might be looking for something more along the lines of Sculpey, which can be hardened by baking it in the oven.

Can a plaster mold be used with this clay

Yes. You can make a sculpture out of this clay and make a plaster mold off of it. I would spray the clay surface with some Krylon crystal clear acrylic spray first to seal the clay and help the clay to come out of the mold easier. also...try to remove the clay out of the new plaster mold while it is still warm. Don't let the clay become hard again and you will have an easier time of cleaning out the clay from the mold. Hope this helps. Greg

When will the new HARD-Premium Grade style of Monster Clay be available via Amazon for purchase?

“New HARD clay” I wasn’t aware of Hard Clay, maybe it’s a new item coming out. So maybe the new HARD clay will dry. You will have to read the description or go to Monster Makers.com for details.

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Monster Clay Premium Grade Modeling Clay - Medium - (18lb CASE) - Brown - 18 pounds - Modeling

Product ID: 4262074

Details

Age Range (Description)
Adult
Brand
EZEAOR
Color
Brown
Educational Objective
Dexterity
Included Components
Oven-Safe
Material
Clay

🔥oven-safe container

♻️reusable & remeltable

⚖️18lb bulk case

SAR 1258

Duties & taxes included

In stock

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Description

🎨 Sculpt like a pro, create like a monster!

ENDLESS REUSABILITY - Remelt and reshape indefinitely—your masterpiece evolves with you.
OVEN SAFE CONVENIENCE - Melt, mold, and reuse directly in the container—no mess, no fuss.
MASSIVE 18 LB BULK CASE - Get 25% more clay per pound—sculpt without limits.
SULFUR FREE NON TOXIC - Safe for platinum silicone molds and your creative workspace.
MEDIUM CONSISTENCY WITH HIGH PLASTICITY - Perfect balance for detailed sculpting and smooth finishes.

Monster Clay Premium Grade Modeling Clay is a professional, oil/wax-based sculpting medium favored by creature designers worldwide. This 18lb sulfur-free, non-toxic clay offers medium consistency with high plasticity, packaged in convenient oven-safe containers for easy melting and reuse. Its unique elastic quality when warm and compatibility with platinum silicone molds make it ideal for detailed modeling and life cast copies, delivering 25% more clay per pound than typical oil-based clays.

Specifications

ASIN	B008UZLGIW
Age Range (Description)	Adult
Age Range Description	Adult
Best Sellers Rank	#105,562 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #451 in Pottery & Modeling Clays
Brand	EZEAOR
Brand Name	EZEAOR
Color	Brown
Customer Reviews	4.8 out of 5 stars 95 Reviews
Educational Objective	Dexterity, Shape Recognition
Included Components	Oven-Safe Container
Item Dimensions	7.48 x 7.48 x 12.01 inches
Manufacturer	Monster Makers
Manufacturer Part Number	MCP-20
Material	Clay
Material Type	Clay
Model Name	Monster Clay
Model Number	MCP-20
Number of Items	1
Other Special Features of the Product	Non-Toxic
Recommended Uses For Product	Modeling
UPC	686603385562
Unit Count	288 Fluid Ounces

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