How to Stop Resin Sticking to Silicone Moulds

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How Do I Keep Resin from Sticking to My Mould?

Resin can sometimes stick stubbornly to silicone moulds, making demoulding tricky and risking damage to your project. With a few simple techniques, you can ensure your resin pieces release cleanly every time.

Timely Demoulding: Why 12 Hours Matters

The timing of removing your resin casting is crucial for an easy release. It is generally advised to demould your piece within 12 hours of pouring, before the resin fully cures and begins to bond with the inner surface of the mould. Waiting longer can increase the risk of sticking, especially with intricate or deep-set designs. For best results, set a timer and gently flex the mould to help release your cast item without damage.

Mould Release Agents: When to Use Them

If you notice persistent sticking or you’re working with complex shapes, a mould release agent can make demoulding much easier. These sprays or liquid releases form a barrier between resin and mould, reducing surface tension and helping with repeated use. Apply a thin, even coat before pouring your resin for reliable results, especially if you reuse your moulds frequently.

Choosing the Right Silicone Mould

Not all moulds are created equal. High-quality silicone moulds with a non-stick surface and suitable hardness provide the easiest release for resin. Consider purpose-made options like the “Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making. Using the right mould means less risk of tears, clearer detail, and a smoother demoulding process for your fishing sinkers or other resin castings.

When This Matters Most

Preventing resin from sticking is especially important when working with moulds for detailed or reusable items, such as when making multiple fishing sinkers. Frequent use can increase the risk of build-up or bonding, so maintaining clean release methods is key.

Related guides

How To Make Fishing Sinker Moulds With Resin

Mastering clean release techniques ensures your fishing sinker moulds stay in good condition and your results look professional. For a full guide on mould making and use, head back to our main page on making fishing sinker moulds with resin.