Choosing Your Silicone and Project Setup

Pick your silicone based on project complexity. Liquid rubbers are best for fine details, while putty types let you work by hand for smaller objects. Clear workspace, gather the right tools, and choose a product designed for your object’s size and shape.

Step 1: Prepare Your Master Model and Workspace

Begin by cleaning your master model thoroughly to remove dust, oils and fingerprints. Any surface imperfections on your original will transfer to the final mould, so take care at this stage. Choose a mould box that fits your master closely but leaves enough space around all sides, as too little gap can make the mould fragile. Secure the model inside the box using adhesive or apply a small dot of hot glue beneath it.

Some materials, such as unsealed wood or porous items, may benefit from a thin layer of release agent to prevent sticking. For non-porous objects, the inherent non-stick nature of silicone is typically sufficient. Ensure your workspace is well-ventilated and at room temperature for best results.

Step 3: Allow the Mould to Cure Fully

Leave the poured silicone to cure according to the product guidelines. Silicone rubbers can vary; for example, “I–Gum” – Non-Toxic Silicone Putty for Mould Making delivers rapid curing in as little as 10–20 minutes (depending on the type), while some liquid rubbers may require several hours. Warm ambient temperatures can support even curing but avoid excessive heat or drafts. Resist the urge to demould early, as this can deform or damage the final product.

Tips and Common Mistakes for Epoxy Resin Mould Making

• Always measure silicone components accurately to guarantee a consistent cure.
• Ensure the model is dust-free; even minor particles can leave marks in your resin cast.
• Allow full curing time before demoulding for a robust and reusable mould.
• Work at room temperature to optimise the flow and cure of silicone materials.
• Avoid rushing the curing process as impatience can lead to distorted or weak results.
• Plan your mould box assembly—leaks during silicone pour are a common beginner mistake, so always check seals before mixing.
• Practice with smaller, simple shapes before attempting complex or multi-part moulds.

Finishing Touches and Reuse

Clean your silicone mould after each use with mild soap and water to prolong its life. Store in a cool, dry place. Well-maintained moulds ensure reliable resin results for future projects.