Trapped Air Can Cause Bubbles in Epoxy Resin

Why Bubbles Form in Epoxy Resin

Bubbles often appear when air becomes trapped during mixing or pouring. Vigorous stirring, incorrect ratios, or pouring too quickly can introduce extra air, which may get locked in as the resin cures. Materials with porous surfaces—like wood—can also release air into the resin. Using a resin designed for deeper pours, such as Epoxytable 10-Ten, helps reduce bubble formation thanks to its super low viscosity.

Practical Tips for Minimising Bubbles

• Mix Gently: Stir components slowly and consistently to avoid whipping in excess air.
• Consider Temperature: Work in a warm, dust-free space; cold resin is more viscous and traps bubbles easily.
• Seal Porous Materials: Apply a thin sealing layer on wood or concrete before the main pour to limit air release.
• Use Multiple Layers for Large Projects: For deep pours, cast in several layers as advised for the product type.
• Post-Pour Bubble Removal: After pouring, use a heat gun or torch lightly over the surface to help release surface bubbles.

When This Matters Most

Bubble prevention is especially important for furniture, jewellery, and decorative pieces where clarity is essential. Larger, thicker castings require extra care, making product choice and pour technique crucial for a smooth finish.