How to Mix and Pour Silicone Accurately for Resin Moulds

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Getting your silicone mix and pour right is crucial in creating high-quality moulds for resin casting. With care and some practical guidance, you’ll achieve crisp details and reliable results every time.

Preparation: The Importance of Accurate Mixing

Start by choosing the appropriate silicone, such as Pure Mould translucent liquid silicone rubber, which typically mixes easily at a 1:1 ratio. Always measure both parts precisely by weight or volume, ensuring full, even proportions. Use clean, dry tools and containers to prevent contamination or curing issues.

Wear gloves for protection and cleanliness.
Work in a dust-free area to avoid particles in your mould.
Mix slowly to minimise air bubbles.

Pouring Techniques for Bubble-Free Results

Once mixed, pour the silicone in a thin, steady stream from a height of about 20–30cm. This helps any remaining bubbles break on the way down. Begin pouring into the lowest part of your mould, letting the silicone naturally flow over details. Tap or gently vibrate the filled mould for a few seconds to release trapped air. If the silicone is translucent, you can visually check that bubbles have risen to the top before the mixture sets.

When Precision Matters Most

If you’re making moulds for fine details, such as 3D-printed models or small resin pieces, accurate mixing and careful pouring are especially important. Platinum-based silicones like Pure Mould are designed for these applications, offering clarity and mechanical strength for both hobbyists and professionals.

Related guides

How To Build A Mould For Resin

Careful mixing and pouring are at the heart of creating durable, detailed moulds—an essential step in the resin mould building process. For more comprehensive mould-making advice, explore our full guide on how to build a mould for resin.