How to Remove Bubbles from Resin After Dying

Are you tired of dealing with bubbles on your homemade DIYs? This article will tell you how to remove bubbles from resin after dying, which has proven to be one of the biggest problems people face.

There are numerous ways to go about this and understanding treating resin at home is really important if you’re a huge fan of DIY. With Counter Culture DIY, you can get the best products in the market all at reasonable prices. Let’s help you fuel your hobbies!

Why Bubbles Appear in Resin After It’s Dried

Before you can learn how to remove bubbles from resin after drying, it helps to understand why they form in the first place. Even if your resin project looked flawless when freshly poured, tiny air pockets can sometimes appear hours or even days later as the resin cures.

These bubbles are caused by several factors, most of which are easy to prevent once you know what to look for.

Trapped Air and Off-Gassing

Porous materials like wood, flowers, paper, and clay can release trapped air as resin warms and begins to cure. This little reaction is called off-gassing, where bubbles are pushed up through the resin layer. If the resin sets before the air escapes, you’ll probably end up seeing tiny pockets in the finished surface!

Temperature and Humidity Changes

Cold resin is thicker and traps air more easily. When your workspace is too cool or humid, bubbles can’t rise to the surface before curing begins. Warming your resin and keeping your environment around 75–85°F helps minimize this.

Mixing and Pouring Techniques

Stirring too quickly, or pouring resin from too high above your mold or surface, can introduce air into the mix. The faster you stir, the more air you trap. Slow, steady mixing and low, controlled pouring keep bubbles from forming in the first place.

Uneven Cure or Resin Thickness

If your resin layer is poured too thick, bubbles may get trapped deep inside and fail to reach the surface before hardening. Likewise, fast-curing resins or high heat can “lock in” bubbles before they have a chance to pop.

Learn more on issues with resin projects and their preventative measures.

Preventing Bubbles in Future Resin Projects

Now that you know how to remove bubbles from resin after drying, the best next step is learning how to prevent them altogether. Bubbles are one of the most common frustrations for fellow resin artists, but a few simple adjustments to your process can make all the difference.

Remember, the goal is to control air, temperature, and curing conditions so your resin cures crystal-clear every time.

Warm Your Resin Before Mixing

Cold resin traps air more easily and becomes thicker, making it difficult for bubbles to rise and escape. Before mixing, place your sealed resin and hardener bottles in a warm water bath (not hot) for 5–10 minutes. This lowers the viscosity, allowing bubbles to release naturally as you stir and pour.

Mix Slowly and Steadily

Fast, vigorous stirring introduces air into the resin. Instead, use a gentle, folding motion and scrape the sides and bottom of your cup to ensure a thorough mix. Once combined, let your resin rest for a few minutes to allow any air bubbles to surface before pouring.

Pour Close to the Surface

Pouring from high above your project can introduce air as the resin falls. Always pour slowly and close to the surface, especially for deep molds or layered pours. This reduces turbulence and keeps bubbles to a minimum.

Seal Porous Materials

If you’re embedding natural materials like wood, paper, or dried flowers, always seal them with a thin layer of resin or a clear sealant before your main pour. This prevents trapped air from escaping during curing, which is one of the biggest causes of post-drying bubbles.

Maintain the Right Workspace Conditions

Temperature and humidity play a huge role in how your resin behaves. Aim for a workspace around 75–85°F (24–30°C) and keep humidity low. Avoid fans because they can cool resin unevenly and trap air during curing. You certainly don’t want that!

For the best resin products, head over to Counter Culture DIY to make sure you never find a bubble again!

How to Fix Bubbles in Resin After It Has Dried

The truth is, no matter how hard you try, bubbles sometimes, and somehow, always show up after your resin has cured. The good news is that you can still save your piece. Apart from shopping for quality epoxy resin at Counter Culture DIY, you can also practice the following:

Method

What to Do

Assess the Bubbles

Examine your piece in bright light. Surface bubbles look like small dents or blisters, while deeper ones may appear as cloudy spots or tiny craters. Identifying the depth helps you choose the right fix: light sanding for surface bubbles or filling for deeper ones.

Sand the Surface

For minor imperfections, start with fine-grit sandpaper (around 220–400 grit) and gently sand the affected area until it's smooth. Move to higher grits (600–1000) for an even finish. Wipe away dust with isopropyl alcohol or a lint-free cloth before recoating.

Apply a Fresh Resin Flood Coat

After sanding, mix a small batch of clear resin and apply a thin, even flood coat over the entire surface. This new layer will fill in sanded spots and restore the glossy shine. Use a heat gun or small butane torch to quickly pass over the surface. This helps any new air bubbles rise and pop before curing.

Fix Deep Bubbles or Pits

If bubbles are embedded deeper in the cured resin, lightly sand down to reach them, clean the area, and fill it with a small amount of mixed resin or UV resin. Let it cure completely, then sand and polish smooth. For large, deep flaws, you may need to pour a thin new layer over the entire piece for a seamless look.

Polish and Finish

Once the final coat has cured, polish the surface with a microfiber cloth or polishing compound to bring back its high-gloss shine. Your piece should now look as clear and smooth as it did before the bubbles appeared.

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