Making Rigid Molds With
Fast-Cast Urethanes

Ideal for smaller models/molds with a flat side, fast-cast urethanes are widely used for their ease of use, low cost, and quick demold times. However, their use requires careful application of release agents.

Urethane Rubber

Urethane Rubber molds are widely used when a flexible mold material is required and a more expensive or less abrasion-resistant silicone rubber is not desired. However, their use requires careful application of release agents.

Simple Silicone Rubber Molds
(no parting line)

Ideal for smaller projects (less than 12" x 12"), this is the easiest process for creating parts, patterns, tools, & molds. We demonstrate creating a silicone rubber mold and then the casting of parts with Repro, epoxy casting resins and polyurethane elastomers.

Two-Part Silicone Rubber Molds
(with a straight parting line)

When mass casting a part without a flat side, you must create a two-part mold. We create a two-part silicone rubber mold with a clean parting line and then cast the part with Repro.

Casting Thin-Walled

Casting thin-walled parts follows a similar process to the mass casting video above. However, this project requires important differences in venting, gating, and the use of pressure.

Casting Molds & Models With Intricate Detail

The more detailed your patterns, the more difficult it is to cast void-free molds and parts. Here we show you a few tricks to get consistently better results when working with highly detailed castings.

Moldmaking With Clear Silicone Rubber

When a project requires a complex parting line, it is often easier to pour the entire mold in one process with clear rubber, then cut your parting line. This process also saves at least a day in creating the mold.

Silicone Rubber Molds with Complex Parting Lines

Sometimes making a straight parting line (or even a simple curved one) isn't practical. Therefore, one must be creative when forming the two halves of a silicone rubber mold. This process shows one method for creating complex parting lines.

Multiple Cavity

When a project requires numerous duplications, a multiple cavity mold is created, enabling many more duplications to be created in a set amount of time.

Surface Casting #1
(featuring Gap Wax)

Ideal for working on medium-sized projects, this process of pouring a high quality material around a lower quality core creates a highly accurate, yet economical part.

Surface Casting #2
With Brushable Resin

Here we demonstrate an alternative method for surface casting using a thixotropic additive with our Freeman 1060 semi-rigid urethane.

Using Fillers & Pourable Foam
to Lighten a Casting (& More)

When you want to lighten the weight and/or the cost of a medium-sized casting, it is worthwhile to explore the use of lightweight fillers. Plus, other types of fillers are also available to give your castings different material properties.