Tips to Avoid Bubbles in Resin

Why Bubbles Occur During Resin Reinforcement

Bubbles usually form when air gets trapped as resin is worked into reinforcing fabrics such as carbon fibre or fibreglass. This is common if the fabric is not fully saturated, or when resin is applied too quickly. Entrapped bubbles can weaken the structure and leave visible imperfections on the surface.

Techniques for Eliminating Bubbles

• Apply resin steadily and ensure it thoroughly soaks into the fabric, using a brush to work it through and eliminate dry patches.
• Brush gently in one direction to push air outwards towards the fabric edges.
• Where possible, use a dedicated epoxy resin designed to minimise bubble formation, such as “Carbon Resin” – Epoxy Resin for Carbon Fiber & Fiberglass Coating.
• After application, inspect the surface for bubbles and address them with a pin or by lightly passing a heat gun over the resin (take care not to overheat).

When Bubble Prevention Matters Most

Paying close attention to bubble elimination is crucial for applications where both strength and appearance are essential. This is especially true for visible surfaces, composite parts, and any structural component where durability is critical.