Free shipping on orders over £29,85 
Shipping Tracking! 
Google
Facebook← Back to How to make an eraser using silicone?
Air bubbles can be a common source of imperfections when making erasers with silicone moulds. With the right approach, you can achieve smoother, professional-quality results.
Why Air Bubbles Occur in Silicone Moulds
Air bubbles often form when mixing and pouring silicone. Trapped pockets of air can become locked inside the mould, leaving visible imperfections or weak spots in your eraser. Pouring too quickly, over-mixing, or using thick silicone all increase the risk of air entrapment.
Practical Tips to Minimise Bubbles
- Mix Slowly and Carefully: Combine the silicone and activator gently to limit air introduction.
- Pour from Height: Pour the mixed silicone in a thin stream from a slight height; this helps air escape.
- Tap and Vibrate: Gently tap the mould container or use a vibrating surface to encourage bubbles to rise and burst before curing begins.
- Use a Pressure Pot (Optional): If making very detailed or professional erasers, consider curing the silicone in a pressure pot to effectively eliminate bubbles.
Choosing a silicone designed for mould making, such as “Liquid Mould” – Casting Liquid Silicone Rubber, can also make a significant difference due to its fine detail capability and fluidity.
When Bubble-Free Results Matter Most
Minimising bubbles is especially important for small, detailed erasers or when using translucent silicone. Flawless moulds not only look better, they ensure even wear and performance during use, important for both hobbyists and professionals.
Related products
Related guides
By using careful mixing and pouring techniques—and selecting the right silicone—you can prevent air bubbles and create smooth, detailed eraser moulds. For a broader look at making erasers with silicone, see our main guide on how to make an eraser using silicone.