How to Make Silicone Moulds for Epoxy Resin Casting

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Creating your own silicone moulds opens up countless creative possibilities for casting epoxy resin into custom shapes and detailed designs. Whether for jewellery, art, or small models, making a reusable mould at home is straightforward with the right techniques and products.

Choosing the Right Silicone for Your Project

Successful resin casting starts with selecting a suitable silicone mould material. Liquid silicones such as “Pure Mould” and “Liquid Mould” offer high detail and are ideal for intricate shapes or undercuts. For quick, smaller objects or simple forms, a putty-type like “I–Gum” is easy to knead by hand and requires minimal setup. Look for products with a user-friendly 1:1 mix ratio and ensure compatibility with epoxy resin for best results.

Basic Steps for Making a Silicone Mould

Prepare your master: Place the object you wish to copy in a snug-fitting container, ensuring it won’t float when the silicone is poured.
Mix the silicone: Combine base and catalyst thoroughly, following the supplied instructions for ratios and working time.
Pour or press: For liquid rubber, pour gently to avoid trapping air bubbles. For putty, shape it evenly around the master. Tap or shake the mould gently if possible to release any air.
Allow to cure: Depending on the silicone, curing may take 2–12 hours. Wait until fully set before demoulding.

Tips for High-Quality Epoxy Resin Casts

To achieve crisp resin results, ensure your mould is clean, fully cured, and placed on a level surface. Avoid release agents—most quality silicones, such as “I–Gum”, are inherently non-stick with epoxy resins. For very fine detail, consider using a pressure pot during curing to minimise bubbles, especially when using low-viscosity liquid silicones.

When This Matters

Making your own silicone moulds is especially useful if you need repeated, detailed resin castings or wish to work with bespoke or non-standard shapes. Custom moulds can offer a more professional finish and open up creative possibilities not found in ready-made options.

Related guides

Does Epoxy Resin Adhere To Silicone

With the right silicone and careful preparation, it’s easy to produce durable, high-quality moulds for your epoxy resin projects. For further guidance and more options, see our main page on epoxy resin and silicone adhesion.