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Flexible silicone moulds are a popular choice for pouring epoxy resin due to their ability to capture fine details and release casts easily. However, without proper support, these moulds can distort—leading to uneven or failed resin projects. Understanding how and why to support them ensures professional results for novices and experts alike.
Why Flexible Moulds Need Support
Silicone moulds are naturally pliable, which makes them ideal for demoulding complex shapes. But this flexibility means they can bow, sag or bulge when filled with heavy or liquid epoxy resin. Any movement in the mould walls during curing may cause misshapen or warped castings, especially with large or intricate designs. Supporting the mould ensures your finished piece retains its intended form and crisp detail.
Methods to Support Your Silicone Mould
- Box or Cradle: Place your mould inside a rigid container, such as a sturdy plastic tub or wooden frame, snug enough to prevent shifting.
- Custom Fitted Support: Build a support structure around unusually shaped moulds using materials like foam or sand to keep every side steady.
- Flat Surfaces: Ensure the mould sits on an even surface to avoid unwanted tilts or curves.
If you are making your own flexible moulds, products like “Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making offer durable results suitable for repeated projects, but still require external support during the resin pour.
When This Matters Most
Support becomes particularly crucial for large, shallow or thin-walled moulds, or when you’re working with heavier resin volumes. Projects that demand precise shape retention—like coasters, jewellery trays, or art pieces—benefit most from proper mould support to prevent unexpected bending or distortion.
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By always supporting your flexible silicone moulds, you ensure each epoxy resin cast comes out clean, correct and ready to shine. For more tips and guidance on creating and using silicone moulds with resin, see our full guide on how to make silicone moulds for epoxy resin.