How to Avoid Bubbles When Casting Insects in Resin

Clear, bubble-free resin casts bring out the finest details in preserved insects. Bubbles, however, are common but avoidable with the right approach and materials.

Seal Your Insect Specimen

Begin by ensuring your insects are completely dry and sealed. Applying a thin coat of clear-drying sealant, such as acrylic spray or a gentle brush-on varnish, helps prevent air trapped in the insect from releasing as bubbles once submerged in resin. This step is vital whether you’re casting small jewellery pieces or larger decorative blocks.

Mix and Pour Resin Slowly

When working with transparent epoxies like “Trasparente” multipurpose clear epoxy resin, mix resin and hardener gently and thoroughly to reduce trapped air. Avoid vigorous stirring, which introduces bubbles. Pour the resin in thin layers—no more than the recommended thickness for your product (up to 2cm for “Trasparente”, 1.5cm for “Icrystal”). Pour against the side of the mould for best results.

Releasing Remaining Bubbles

After pouring, inspect your cast for lingering bubbles. Use a toothpick or pin to pop visible surface bubbles. For finer bubbles, pass a craft heat tool or small torch carefully above the surface to help them rise and disperse. Avoid overheating, especially with deep pour resins, as this may compromise clarity and the final finish.

When Bubble Prevention Matters Most

Creating jewellery or decorative art where clarity is crucial
Preserving detailed or delicate insect specimens
Using thick pours or deep setting resin for large display pieces

Related guides

With mindful sealing and patient pouring, you can cast insects in resin with professional, clear finishes. For more tips and step-by-step details, visit our main guide on how to embed insects in resin.