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Self-hardening white clay. Prepared in moist form and ready to use. When completely dry, finished pieces are hard and durable.

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Air Dry and Self-Hardening Clays > Stonex

Conforms to
ASTM D-4236
The Art & Creative Materials Institute AP (Approved Product) seal certifies this product to be safe for use by all ages.

Stonex is labeled with the AP seal.


Although Lesson Plan #29 is shown using Mexican Pottery Clay, Stonex can be substituted.

For project ideas, please visit our Craft Library by clicking here.

This white, self-hardening modeling clay is prepared in moist form, ready to use for all methods of modeling, including wheel throwing and sculpting.

When completely dry, finished pieces are durable but not waterproof. Knead StonexTM to increase plasticity before modeling. Keep unused clay in a plastic bag or wrapped in damp cloth to prevent drying out.

It will shrink during drying, so it is best to hollow out bulky sculptures or wrap a slab of clay around a loose crumpled paper armature before modeling.

Allow the finished piece to dry slowly and evenly on all sides at room temperature and away from heat until hard. When piece is completely dry, decorate with AMACO® Rub 'n Buff®, school paints, temperas, acrylics or liquid crayons.

After decorating, it is a good idea to coat with shellac or varnish to seal it and make it water resistant.

We certify that AMACO only ships LEAD FREE products in compliance with the Consumer Product Safety Improvement Act of 2008.

To download a copy of the STONEX CLAY AP (Approved Product seal) MSDS sheet in PDF format, please click here.

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Air Dry and Self-Hardening Clays > Stonex

Stonex main product image:


Air Dry and Self-Hardening Clays > Stonex Available Items:

X-35; 5 lb. box (Item #47338C)

X-25; 25 lb. carton (Item #47339A)

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