Should You Seal Organic Objects Before Embedding in Resin?

Do organic objects need sealing before embedding in resin?

When working with resin, you might wish to preserve flowers, wood, or other natural items within your piece. Proper preparation is key to ensuring your embedded objects remain beautifully protected and don’t cause issues in the final project.

Why Sealing is Important

Organic items such as flowers, leaves, wood slices, and other natural materials are often porous and sensitive to moisture. If these items aren’t properly prepared, moisture can create bubbles, cloudiness, or even decomposition inside your finished resin. Sealing acts as a protective barrier, helping to lock out the resin and keep the item’s appearance intact over time.

How to Seal Organic Items for Resin Projects

Always start by making sure your items are thoroughly dry—this is the most important step. Any leftover moisture can lead to cloudiness or even decay. Once fully dry, you can apply a sealing layer. Clear acrylic sprays and specialised resin primers are both excellent options for sealing delicate pieces, including pressed flowers and thin wooden shapes. Apply light coats to prevent discolouration, and ensure the item is completely coated before embedding it in resin.

For deep resin pours with embedded objects, a product such as EpoxyTable 5-Five can be used after sealing, with its low exothermic reaction helping to preserve embedded details.

When This Matters Most

Sealing is particularly important if you’re embedding items with fine details, delicate structures (like petals), or small air pockets. It’s also vital in high-humidity environments or for larger castings that cure slowly, as these scenarios increase the risk of unwanted reactions between the organic item and the resin.

Related guides

How To Embed Objects In Resin

Taking the time to dry and seal your organic materials will help you achieve a clear, bubble-free finish and protect the beauty of your creations. For more tips on preserving natural objects in resin, visit our main guide on how to embed objects in resin.