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Bubbles in epoxy gelcoat are a common issue but can be effectively minimised or removed with the right techniques. Achieving a glass-smooth finish is possible with some careful steps during mixing and application.
Why Do Bubbles Appear?
Bubbles often form in epoxy gelcoat when air is trapped during mixing or pouring. Vigorous stirring is a typical cause, and bubbles can also become trapped when the resin is poured rapidly onto the surface or worked into corners and edges.
Practical Techniques for Bubble Removal
- Gentle Mixing: Stir your epoxy slowly rather than shaking or whisking. This helps minimise the introduction of air during preparation.
- Popping Surface Bubbles: Once poured, pass a heat gun gently over the surface. The heat causes bubbles to rise and burst, resulting in a clearer finish. Alternatively, use a fine needle to pierce and release stubborn bubbles.
- Timing is Key: Address bubbles immediately after pouring, while the gelcoat is still liquid and workable.
Using a resin designed for art coatings, such as “Art Pro” Clear Epoxy Resin, can further help by providing the right viscosity for smooth, even layers.
When Bubble Control Matters Most
Meticulous bubble removal is especially important for decorative pieces, transparent finishes, and items intended for display. In these cases, clarity and gloss are essential to highlight colours or embedded materials beneath the gelcoat.
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Careful attention to mixing and surface finishing will help you avoid bubbles in your epoxy gelcoat projects. Perfecting these techniques supports the high-quality results you’ll find in our full guide on how to make an epoxy gelcoat.