How to Prevent Bubbles in Heather Resin Projects

How do I prevent bubbles in heather resin?

Bubbles can spoil the clarity and appearance of your heather resin creations. With a few careful steps, you can minimise trapped air and achieve beautiful, glass-like results every time.

Essential Preparation for Bubble-Free Casting

Start by ensuring your heather and any other inclusions are completely dry. Moisture trapped in the plant material can cause pockets of air to form during curing. When mixing your resin, stir slowly and deliberately, scraping the sides and bottom to blend without whipping in excess air.

Gently fold the resin and hardener together rather than beating them
Let the mixed resin sit for a minute to allow surface bubbles to rise before pouring
If using a product like Icrystal – Clear Epoxy Resin, its low viscosity helps bubbles escape naturally

Pouring and De-Gassing Techniques

When ready to cast, pour your resin slowly from one point, letting it flow gently over and around the heather. This method reduces agitation, further limiting bubble formation. For surface bubbles, use a heat gun or craft torch, moving it steadily and keeping it at a safe distance to avoid overheating or damaging the resin. Repeat the process a few times during the working window as bubbles may continue to rise.

When Bubble Prevention Matters Most

Avoiding bubbles is especially important if you’re creating memorial pieces or jewellery, where clarity is crucial for highlighting delicate flowers. Larger tabletops or display items benefit from these precautions too, as imperfections are more visible in thick or clear pours.

Related guides

How To Make Heather Resin

Taking the time to mix, pour, and finish your resin with care ensures your heather is beautifully preserved and clearly visible. For more advice on crafting stunning botanical resin pieces, explore our hub on how to make heather resin.