Silicone Mould Mixing and Pouring

Handling silicone requires careful mixing for a successful mould. Always combine parts A and B in the ratio specified by your chosen product. Slowly pour the silicone into the lowest corner of your form to ensure even spread without trapping air. Work methodically for edge-to-edge coverage and consistent thickness.

Step 1: Prepare Your Model and Formwork

The first step is to set up the formwork that shapes your silicone mould. Choose a flat, non-porous base—melamine boards are ideal for this purpose. Use formwork materials such as acrylic or plywood to build sturdy walls, securing all joins tightly and sealing corners to prevent leakage. Clean your table model thoroughly to remove dust or debris that could transfer unwanted textures to the mould. If using intricate models, ensure the surface is dry and stable. Position the model centrally within the formwork and anchor it if needed to avoid movement during silicone pouring.

Step 3: Curing and Demoulding Your Silicone Mould

Allow the silicone to cure as per product instructions—curing times can range from 20 minutes (for “I–Gum” Putty) to several hours (typically 3–8 hours for “Pure Mould”, or longer for thicker pours). Protect the mould from dust or movement during this period. Once cured, flex the formwork to gently release the silicone mould. If corners or undercuts stick, avoid forcing—slowly peel away, ensuring the mould retains shape. Inspect for any surface defects or trapped bubbles, especially in fine-detail areas, before removing the original.

Tips, Common Mistakes, and Troubleshooting

• Always measure and mix silicone precisely to ensure a consistent cure and durable mould.
• Check for undercuts before pouring silicone, as complex forms may require slits in the mould for easier demoulding.
• Let silicone cure fully before demoulding—rushing this step can distort details or cause tearing.
• Apply a release agent if your surface requires it, especially with porous or timber patterns, to prevent accidental bonding.
• If air bubbles are visible on the mould surface, consider degassing the silicone or tapping the formwork more vigorously next time.

Perfecting Mould Surfaces for Resin Tables

Smoothing the inner mould surface is key for flawless resin results. Fill small imperfections on your model before pouring silicone. Polished surfaces yield glossier resin pieces. If the mould develops minor scratches, these can usually be buffed out before the next resin casting for an attractive finish every time.