How to Prevent Bubbles When Mixing Epoxy Resin

How Can I Prevent Bubbles When Mixing Epoxy Resin?

Bubbles are a common frustration when working with epoxy resin, but with the right approach, you can achieve a smooth, glass-like finish for your creations. Here’s how to minimise and remove bubbles from your resin projects.

Mix Slowly and Carefully

When mixing epoxy resin and hardener, stir slowly with a flat stick or paddle. Rapid or vigorous mixing can introduce air, leading to unwanted bubbles. Scrape the sides and bottom of your mixing container as you stir, but try not to lift the tool in and out of the liquid. For best results, follow the recommended mixing ratios precisely—kits like the One-2-One Epoxy Resin and Evershine Collection use easy 1:1 formulas, which simplify the process and help reduce errors that could affect bubble formation.

Pour and Finish With Care

Once combined, pour the mixed resin gently into your mould or onto your surface. Try to let the liquid flow slowly to avoid trapping bubbles. After pouring, hold a heat gun or torch a safe distance above the surface and wave it briefly back and forth. The gentle warmth encourages trapped bubbles to rise and pop before the resin begins to cure. Remember not to overheat, as too much heat can cause other problems in your project.

When This Matters Most

Minimising bubbles is crucial for projects with clear resin finishes—such as jewellery, art pieces, and table surfaces. Bubbles can distract from inclusions like dried flowers or intricate designs, so taking a little extra care during mixing and pouring pays off with a flawless, professional-looking result.

Related guides

Mastering bubble-free resin mixing elevates the look and longevity of your DIY and craft projects. For further guidance on the entire resin mixing process, see our main guide: How do you mix epoxy resin?