Can I cast hot wax into an Alja-Safe alginate mold?

Article courtesy of Smooth-On, Inc.

Hot wax is difficult to cast solid. The best casting technique is to build layers of wax into the mold.

Fill the mold cavity to the top with the hot, liquid wax and then pour it out. Wait a few minutes for the first layer to set up, then pour in and out again. Let it set again and pour more wax in and out again.

The finished wax casting thickness should be about 1/4" – 3/8" (0.6 cm – 1 cm).

Your casting needs to cool for several hours before demolding. If not fully cured, delicate details (like fingers) will break off easily.


This FAQ article is offered as a guideline and offers possible solutions to problems encountered during mold making and casting. No warranty is implied and it is up to the end user to determine suitability for any specific application. Always refer to the provided Technical Bulletins (TB) & Safety Data Sheets (SDS) before using any material. A small scale test is suggested to determine suitability of any recommendation before trying on a larger scale for any application.