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Epoxy resin projects are renowned for their glossy, glass-like finishes. However, unwanted air bubbles can spoil the effect if you’re not careful. Understanding why bubbles arise during mixing and pouring is the first step to professional results.
Common Sources of Air Bubbles
Air bubbles most often occur due to how resin and hardener are combined. Rapid or vigorous mixing traps air in the thick liquid, while pouring too quickly can introduce further bubbles. High viscosity resins are more prone to hold these bubbles, making smooth blending trickier.
- Rapid stirring during mixing
- Poorly acclimatised, thick resin
- Quick or high pours
How Environmental Factors Play a Role
Temperature and humidity in your workspace can also affect bubble formation. Cold conditions make resin thicker and slower, trapping more air. Excessive humidity may worsen bubble issues as moisture can interact with the resin mixture during curing.
Practical Steps to Minimise Bubbles
Using slow, steady mixing methods helps avoid drawing in extra air. Gentle tools such as the Anti Bubble Mixer for Epoxy Resin – Reusable Mixing Tool are specifically designed for this purpose. Allowing your resin to rest briefly after mixing can also help bubbles rise to the surface, while applying brief heat—such as from a heat gun—can assist in removing surface bubbles before curing.
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Knowing what causes air bubbles is a crucial foundation for perfect finishes in resin work. Explore more about bubble prevention and removal in our main guide on removing air bubbles from epoxy resin.