This product is similar to the regular Molding Paste, but develops a much harder film. When dry, it can be carved with hand or power tools, and is readily sandable. It can be used on rigid supports like wood to add designs or texture to the object. Hard Molding Paste can also be mixed with acrylic paints or painted over.

Flexibility can be improved by blending with regular Molding Paste or Regular or Heavy Gel. To minimize the chance of cracking, avoid applying a single layer thicker than 1/4 inch. Multiple layers can be applied to achieve thicker overall applications; this actually facilitates faster drying.