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Air bubbles are a common challenge when making silicone moulds for resin casting. Fortunately, one of the most effective and simplest approaches to reduce bubbles is to pour your silicone slowly from a single corner, allowing the liquid to gradually flow and gently cover your model.
Why Pouring from One Corner Makes a Difference
Pouring silicone steadily from one corner ensures that the material envelopes your original model slowly and evenly. This helps the silicone flow around details rather than trapping air pockets. Allowing the silicone to rise naturally minimises the disturbance that typically introduces bubbles, leading to a smoother finished mould.
Practical Steps for Bubble-Free Moulds
- Prepare in Advance: Mix your silicone gently, reducing vigorous stirring that can whip air in.
- Angle Your Pour: Start at the lowest point or a corner of the mould box, letting the silicone seek its level without interruption.
- Go Slow: Pour in a thin, continuous stream and avoid moving your pouring spot around; let the silicone travel across the piece of its own accord.
If you are using a high-quality moulding material such as “Pure Mould” translucent liquid silicone rubber, its ease of mixing and flow will also aid in bubble reduction, making it especially suitable for capturing fine details.
When This Matters Most
Paying attention to how you pour silicone is essential when working with moulds that contain intricate patterns or deep recesses. Bubbles can obscure details and weaken the integrity of your final resin casting. For items you plan to reproduce multiple times or sell, pristine results are especially important.
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Mastering the simple technique of pouring silicone slowly from one corner can dramatically improve your resin moulding results. This foundational skill complements more advanced methods detailed on our main guide to how to make moulds for resin.