How to Eliminate Trapped Air Bubbles on Resin Surfaces

Why Do Bubbles Form in Resin?

Bubbles often appear during the mixing or pouring stages of resin use. Vigorous stirring, pouring from a height, or using cold resin can trap air within the mixture. These bubbles can rise to the surface but sometimes get lodged, marring the finish if not managed promptly.

Safe and Effective Ways to Remove Bubbles

• Isopropyl Alcohol: Gently spritzing or applying drops of 99.9% pure isopropyl alcohol (such as this bottle for resin projects) onto the uncured surface helps trapped bubbles escape, leaving a smoother finish. Always use alcohol in a well-ventilated area away from open flames, as it is highly flammable.
• Slow and Careful Mixing: Stir your resin and hardener slowly to minimise air introduction. Allow the mixture to rest briefly before pouring to give bubbles time to rise.
• Optional Heat Tools: For more experienced crafters, a quick pass of a heat gun or torch over the surface can help—but only if it’s done cautiously to avoid overheating.

Practical Tips for Better Results

• Ensure your resin and workspace are at room temperature before starting.
• Pour resin in thin layers, as this reduces the number of trapped bubbles and makes removal easier.
• Consider specialist training, like the Resin Class – 3D Effects Coasters Masterclass, to master finishing techniques and avoid common mistakes.