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How to Embed Objects Without Trapping Air in Resin or Silicone

How to Embed Objects Without Trapping Air

Ever tried to embed a flower or a toy into resin or silicone, only to be frustrated by those pesky little air bubbles? You’re not alone. Air bubbles are a common issue when working with embedding materials like epoxy resin or silicone rubber. But the good news is: they’re avoidable.

Whether you’re creating jewelry, resin

preserving natural items, or casting custom pieces, these tips will help you embed your objects cleanly and professionally — without trapped air.

Why Air Gets Trapped in the First Place resin

Air becomes trapped when you pour resin or silicone too fast, or when the object you’re embedding has small cavities or uneven surfaces. Sometimes it’s even the result of the ambient temperature or moisture in the object itself.

Common Triggers of Air Bubbles:

Pouring too quickly

Not sealing porous materials (like paper or flowers)

Trapped moisture in the object

Cold working environment

Uneven mold surfaces

Step-by-Step: How to Embed Without Trapping Air

1. Seal Porous Items First

Natural materials like leaves, flowers, or wood are full of tiny pores that trap air. Always seal them with a clear-drying glue or spray resin before embedding.

Tip: Use a light mist of clear acrylic spray or Mod Podge for organic items.

2. Use a Pressure Pot or Vacuum Chamber resin

For professional results, use a pressure pot (for resin) or a vacuum chamber (for silicone). These tools remove air from the mix and from around your embedded object.

Learn more about pressure casting here

3. Pre warm Your Mold and Resin

Warming the materials slightly reduces viscosity, allowing bubbles to rise and pop more easily. Just don’t overheat it.

Tip: Place your mold on a warm surface like a heating pad set to low

4. Pour Slowly and in Layers resin

Instead of pouring all at once, build up your layers. This helps air escape naturally and gives you more control.

Start with a thin base layer

Position your object carefully

Add more layers gradually

5. Use a Toothpick or Small Tool to Nudge Bubbles resin

Sometimes all it takes is a gentle nudge. Use a toothpick or skewer to manually pop surface bubbles or guide them out of tricky areas.

6. Finish With a Heat Gun or Torch

A quick pass with a heat gun or small torch will pop surface bubbles. Be careful not to overheat — especially if you’re working with silicone, which can burn

 

Final Thoughts

Trapped air can ruin an otherwise beautiful piece. But with the right prep, tools, and techniques, you can eliminate bubbles and create smooth, professional-looking results every time.

Whether you’re making keepsakes,

art, or DIY gifts, mastering the no-air technique is a game changer.

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Happy crafting!

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