Will Silicone Rubber Stick to Clay Models?

How Silicone Rubber Interacts With Clay

Most silicone rubbers will not form a permanent bond with non-oily, water-based clay. This is good news for mould makers, as it allows for simple demoulding without damaging the original sculpture. However, the clay must be dry and clean—loose dust or moisture can cause surface issues or slight sticking, making removal tricky and affecting the final detail of your silicone mould.

Best Practices for Demoulding Success

• Preparation: Always let your clay model dry completely before pouring or pressing silicone rubber onto it.
• Cleanliness: Remove any dust, remnants or fingerprints with a soft brush or gentle air.
• Avoid oil-based clays: Most silicones will release from non-oily clays more easily. If your clay is oily, a light barrier may be needed for effortless release.

Using a suitable silicone, such as “Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making, helps ensure fine detail capture and straightforward removal of your original model.

When This Matters

Getting the release right is crucial if your clay master is a unique piece you wish to preserve, or if the detail level is important for your cast. If residue is left behind or the model sticks, both the clay and mould can be damaged.