Preventing Air Bubbles in Silicone Moulds

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Trapped air bubbles are a common challenge when making silicone moulds for resin tables. Fortunately, with a few careful techniques, you can achieve smooth, bubble-free results for a flawless finish.

How to Minimise Bubble Formation

The most effective way to reduce bubbles is to pour silicone slowly, ideally into one corner of the mould box and let it flow naturally over your embedded piece. Pouring in a thin stream helps break up air pockets before they get trapped. Once poured, gently tap the sides of your formwork or mould box—this vibration encourages any hidden bubbles to rise and escape to the surface.

Using Tools to Improve Bubble Release

If you have access to specialised equipment, a vacuum degassing chamber can draw out air from freshly mixed silicone before pouring, dramatically lowering the presence of microbubbles. For most home and hobby use, careful manual mixing and steady pouring provide solid results, especially when paired with products designed for detailed mould making such as Pure Mould – Translucent Liquid Silicone Rubber.

Practical Tips for Successful Moulds

• Ensure all mixing containers and tools are clean and dry before use.
• Mix the silicone thoroughly but slowly to avoid whipping in extra air.
• If possible, let the mixed silicone rest briefly before pouring to allow surface bubbles to dissipate.

When This Matters Most

Achieving bubble-free silicone is particularly important when making moulds for table edges, embedded details, or projects where surface clarity is essential. The presence of bubbles can affect both the appearance and the durability of your finished resin table.

Related products

• "Pure Mould" – Translucent Liquid Silicone Rubber for Mould Making
• "Liquid Mould" – Casting Liquid Silicone Rubber, 5-40 Shores, Bi-Component A+B
• "I–Gum" – Non-Toxic Silicone Putty for Mould Making

Related guides

• How Do You Make Silicone Moulds For Making Resin Tables

Paying attention to the pouring method and adopting bubble-minimising techniques will help ensure professional results when crafting silicone moulds for resin tables. For more guidance on successful mould making and resin table projects, revisit our main silicone mould making hub.