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Encountering air bubbles in polyester resin is common when coating wood, but gentle brushing can help you achieve a smooth, professional result. Removing these bubbles ensures not only a better-looking finish but also optimal durability and protection for your wooden project.
Why Air Bubbles Form in Polyester Resin
Air can easily become trapped during the mixing or application of polyester resin, especially on porous wood surfaces. Bubbles may rise to the surface as the resin begins to cure, causing imperfections and weak spots. Addressing them early in the application process is vital for a clear, solid finish.
How to Remove Bubbles by Brushing Gently
Once the resin is poured or spread over the wood, use a clean, soft-bristled brush included in kits like the Resin Fibreglass Repair Kit – Complete Polyester Resin and Hardener Set. Gently sweep the brush across the surface in light, even strokes without pressing too hard. This action draws bubbles to the surface, allowing them to burst or escape before the resin thickens. Repeat this process for several minutes after application, as new bubbles may appear while the resin settles.
Practical Tips for Bubble-Free Coating
- Prepare the wood by sanding and making sure it is clean and dry, which helps minimise trapped air.
- Mix the resin and hardener thoroughly but slowly to reduce the chance of introducing excess air.
- Apply in a dust-free area at a moderate temperature; curing too quickly can trap bubbles.
- If necessary, a light pass with a brush after pouring is often sufficient to bring remaining bubbles to the surface.
When This Matters Most
Gentle brushing is especially crucial for projects where a flawless appearance matters, such as decorative wooden pieces, furniture restoration, or boat repairs. It also helps when using highly visible or clear resin finishes, where bubbles would be particularly noticeable.
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Taking time to gently brush away air bubbles ensures your polyester resin coating performs well and looks its best. For a comprehensive solution to wood coating, explore all the steps in our main guide on how to coat wood with polyester resin.