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Bubbles are a common frustration in resin casting, but with the right approach, you can achieve professional, crystal-clear results. Here’s how to keep your resin projects free from unwanted air pockets.
Mixing Matters: Slow and Thorough
Start by mixing your resin and hardener slowly. Fast, vigorous stirring introduces air, which then becomes trapped in the liquid. Gently fold the components together, scraping the sides and bottom of your mixing container to ensure all the resin is incorporated. Slow mixing helps prevent new bubbles from forming, giving your finished piece a much clearer look.
Pouring Techniques for a Smooth Finish
When pouring your resin into a silicone mould, do so in a steady, thin stream from the same spot. This allows bubbles a better chance to rise to the surface and pop, rather than becoming sealed inside your object. Using a high-quality mould, such as our Silicone Circle Mould, can make demoulding smoother and may help reduce bubble retention.
Encouraging Bubbles to Escape
If bubbles do make their way into your resin, there are ways to help them rise and burst. A brief pass with a heat gun or torch over the resin surface will break most surface bubbles. For more intricate or deeper moulds, using a pressure pot can compress the air bubbles, making them nearly invisible once the resin cures.
When This Matters
Bubble prevention is particularly important for projects where clarity is key—such as jewellery, decorative pieces, and coasters. It’s also crucial when using translucent or transparent resins like the “Trasparente” Epoxy Resin Kit.
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Taking time with each stage of your resin project is the key to producing clear, bubble-free creations. For a full overview of techniques and materials for casting with silicone moulds, visit our main guide on how to make resin objects using a silicone mould.