Why Does Resin Sometimes Stick to a New Silicone Mould?

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If you’ve ever had difficulty removing a cured resin piece from a new silicone mould, you’re not alone. Resin sticking is a common frustration for resin jewellery makers, especially when working with freshly prepared moulds.

What Causes Resin to Stick?

Resin usually adheres to a new silicone mould due to two main reasons: incomplete curing and lack of an effective release agent. Incomplete curing occurs if the resin hasn’t fully set according to the manufacturer’s instructions; this can leave the surface tacky and prone to stick. Additionally, using a mould—however high quality—without a dedicated release agent can result in strong adhesion, making demoulding tricky.

Preventing Sticking: Best Practices

• Follow Curing Instructions: Carefully check the resin’s recommended curing times and environmental conditions. Humidity and temperature can affect the curing process, so patience is key before attempting to demould.
• Apply a Suitable Release Agent: Especially with new moulds, a thin layer of a commercially approved release spray can help ensure the resin doesn’t bond with the silicone, maintaining the mould’s finish and extending its lifespan.
• Proper Mould Choice: Choosing a high-quality silicone like “Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making can also make a difference, as it’s designed specifically for compatibility with resin and minimises common sticking issues.

When This Matters Most

Preventing resin from sticking is especially important when your moulds feature fine details or when you’re producing multiple pieces. Damage from sticking can ruin both delicate designs and the longevity of your mould, making preparation and care crucial for bracelet or jewellery making.

Related products

• "Pure Mould" – Translucent Liquid Silicone Rubber for Mould Making
• "Silicone Circle Mould" – For Creating with Epoxy Resin, Ø 20cm
• Rectangular Silicone Tray Mould 30.5x17cm – Reusable for Resin, Soap, Plaster, Clay

Related guides

• How To Make A Mould For A Resin Bracelet

Understanding how to prevent resin from sticking to new silicone moulds saves both time and frustration, making your bracelet crafting experience far smoother. For a step-by-step guide to making your own moulds, explore our main page on how to make a mould for a resin bracelet.