How We Made a 30CM Lady Justice Silicone Mold with a Support Shell

G6003 30CM Lady Justice silicone mold dimensions

The G6003 project is a large Lady Justice bust mold built as a flexible silicone inner mold with a rigid support shell. The finished casting shown here is approximately 30 × 20.3 × 19.7 cm. This workshop record follows the real supplied video rather than presenting a universal formula.

Why the support shell matters

A large flexible mold needs stable external support during pouring and casting. The rigid yellow shell keeps the silicone inner mold aligned and helps the assembly hold its intended shape. Binder clips secure the shell sections while still allowing the mold to be opened for demolding.

Lady Justice silicone inner mold and rigid support shell

1. Seal the bottom edge

The bottom edge is sealed with double-sided tape before pouring. This creates a practical first barrier against leakage at the base of the mold assembly.

2. Start with a small silicone pour

The recorded process begins with a small first batch. Keeping the initial liquid level low reduces pressure at the bottom edge while the seal is checked.

3. Complete the second pour

About 40 minutes later in this G6003 run, the remaining silicone is poured to complete the inner mold. This timing belongs to this workshop record and is not a universal rule for other silicone systems.

Assembled Lady Justice mold support shell with binder clips

4. Cure and demold

The video returns about 4 hours later, when the silicone is fully cured for this run. The support shell is opened and the flexible inner mold is separated carefully so the Lady Justice details can be inspected.

5. Trim and finish

The mold opening and edges are trimmed after demolding. This removes excess material and prepares the mold for the casting test.

6. Test with plaster

A plaster casting test checks the complete form and the reproduced sculptural detail. The video documents the fill, support-shell assembly and final plaster demolding without claiming a special plaster formula.

Real G6003 Lady Justice workshop video frame

Full workshop video

Project resources

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