Choosing the Right Silicone Rubber

Different silicone rubbers suit different projects—select liquid options for maximum detail, or putty for quick, direct applications on small shapes. Always consult your project scale and complexity before deciding.

Step 1: Prepare the Model and Workspace

Carefully plan your mould before you begin. Select the item you wish to reproduce and ensure it’s thoroughly cleaned and dry. Any debris or dust will be permanently captured in the silicone, impacting the finish. Build a sturdy mould box or use an off-the-shelf container large enough to allow at least 1 cm clearance around the model. Use a clean, dust-free workspace to prevent contamination.

If your model is porous (e.g., wood, plaster), seal it with a suitable lacquer or sealer and allow it to dry. This prevents the silicone from adhering unintentionally and helps with demoulding later. Place the sealed model securely in the mould box; you can use glue, clay or double-sided tape to hold it in position if needed.

Step 3: Pour or Apply the Silicone to Make the Mould

Ready your mould box and model, then gently pour the mixed silicone rubber into one corner of the box, allowing it to flow slowly and surround the shape—this helps reduce trapped air. If the project is delicate, pour a thin stream from high above to burst any remaining bubbles.

For the putty method, apply the thoroughly mixed “I–Gum” – Non-Toxic Silicone Putty directly onto the surface of the item, pressing firmly to capture every detail, and then shape the remainder around it for a complete covering.

Refer to your product instructions for setting times: liquid silicone rubbers typically require several hours to cure, whereas putties may be ready to demould in 20–40 minutes.

Tips, Common Mistakes and Troubleshooting

Seal porous models to avoid sticking—never pour silicone directly onto unfinished wood or dry plaster.

Always measure precisely and mix thoroughly for reliable curing. Incomplete mixing may leave sticky, uncured patches.

Mix and pour carefully to prevent unwanted air bubbles; tapping the filled mould box gently can help bubbles rise and escape. Patience during curing is vital—do not attempt to demould before the recommended time.

If you work with intricate jewellery or shapes, you may benefit from using mould sets like the “Five” – 5-Piece Silicone Mould Set for Jewellery Making 9x8cm for reliable, reusable templates.

Insider Advice for Mould Makers

For best results, keep tools and containers free of dust and oils. Patience during curing leads to superior surface quality and longer mould life—never force demoulding or skip the prepping step.