Should You Seal Objects Before Pouring Resin?

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Do You Need to Seal Objects Before Resin?

If you’re planning to embed flowers, photographs, wood, or other materials in resin, sealing those objects beforehand is almost always crucial for a flawless finish.

Why Sealing Matters Before Resin Pouring

Many natural and porous materials—such as paper, dried flowers, fabric, or wood—can trap tiny air pockets. When resin is poured, these bubbles may release and cause cloudy spots or unwanted air pockets. Additionally, colours or dyes can bleed out and discolour the transparent resin. Sealing acts as a protective barrier, helping prevent such issues and ensuring your embedded objects stay sharply defined.

How to Seal Objects for Resin Embedding

To achieve the best results, apply a thin, even coat of a suitable sealer—such as clear-drying PVA glue, acrylic medium, or spray sealant—over the object and let it dry completely before embedding. For items like photographs or delicate botanicals, this extra step greatly reduces the risk of colour bleeding or moisture interference. Make sure the chosen sealer is fully compatible with both your object and the resin system, and always avoid water-based sealers that may reactivate during curing.

Practical Tips for a Flawless Finish

Give special attention to edges and textured surfaces—these are where bubbles hide.
For deeper casts, such as those done with “Trasparente” Epoxy Resin, sealing is especially important to maintain clarity.
Let all sealers dry thoroughly before placing objects in a mould and pouring your resin.

When Sealing Really Matters

Sealing is particularly important if working with dyed paper, botanical inclusions, or porous natural materials. If your project needs maximum clarity—such as jewellery, art pieces, or keepsakes—don’t skip this step.

Related guides

How Do You Put Things Under Resin

Taking time to seal your objects ensures your resin creations remain vibrant and free from unwanted bubbles or discolouration. For more on embedding and the best resin choices, explore our full guide on how to put things under resin.