How to Prevent Bubbles When Mixing and Pouring Resin

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Mix Thoroughly and Pour Slowly to Prevent Bubbles

Creating a flawless resin coffee table requires careful attention to technique. One of the most frequent issues faced by beginners and experienced makers alike is the presence of bubbles in the finished resin layer. Fortunately, the right mixing and pouring methods can help you minimise bubbles and achieve a glass-clear finish.

Why Thorough Mixing Matters

Proper mixing ensures the resin and hardener combine fully, minimising the risk of streaks and uncured zones. Incomplete mixing can leave air pockets that expand into bubbles during curing. Stir your resin and hardener thoroughly, scraping the sides and base of your container to ensure an even blend. Aim for a slow, steady stirring motion rather than whipping, which can introduce unnecessary air into the mix.

Effective Pouring Techniques

When it’s time to pour, go slowly and steadily. Pouring resin too quickly can trap air against your workpiece or mould, increasing bubble formation. Allow the resin to flow gently, starting at one end and letting it self-level across the surface. For projects with thicker layers, such as those using a deep pour resin like EpoxyTable 5-Five, pouring in sections can give trapped bubbles more opportunity to escape before curing begins.

Tips for Bubble-Free Finishes

Warm your resin components slightly before mixing to reduce viscosity, helping bubbles rise and pop.
Use a torch or heat gun on the surface after pouring to eliminate remaining surface bubbles—but take care not to overheat.
Choose a resin kit with low-viscosity and extended working time, such as the “River-Table” Complete Kit, for best results on table projects.

When This Matters Most

Preventing bubbles is essential for any project where clarity and a smooth finish are key, especially resin coffee tables and decorative surfaces. For high-gloss top coats, careful technique is particularly important to achieve a pristine result.

Related guides

Mastering these techniques helps ensure your resin coffee table stands out with a professional, bubble-free finish. For more guidance on each stage of your project, see the full guide on how to make a resin coffee table.