How to Remove Bubbles from Epoxy Resin: A Complete Beginner’s Guide
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Air bubbles are one of the most common problems when working with epoxy resin. Even perfectly chosen resin and a beautiful design can be ruined by many small bubbles on the surface or inside the casting.
The good news is that most bubbles can be prevented before you even start working, and the remaining ones can be easily removed using the right tools and techniques.
In this article, we will explain why air bubbles appear in epoxy resin and how to achieve a perfectly clear result.
Why Do Air Bubbles Appear in Epoxy Resin?
Bubbles can form for several reasons:
- mixing components too aggressively;
- cold resin;
- high humidity in the room;
- porous materials (wood, dried flowers, stones);
- pouring too thick layers;
- incorrect mixing technique.
The sooner you eliminate the cause of bubbles, the easier it will be to achieve a clear, defect-free surface.
How to Prevent Air Bubbles
1. Use Resin at Room Temperature
Before working, it is recommended to keep resin components in the room for at least 24 hours at a temperature of 20–23°C.
Warm resin has lower viscosity, allowing air to escape more easily.
2. Mix Slowly
One of the most common beginner mistakes is mixing components too fast and too aggressively.
Fast mixing introduces a large amount of air into the resin, which later turns into bubbles.
Mix the components with slow, steady movements, carefully scraping the sides and bottom of the cup.
3. Use Proper Mixing Tools
For clean and precise work, we recommend using professional epoxy resin tools:
Proper cups, stir sticks, and accessories significantly reduce the amount of trapped air in the mixture.
How to Remove Bubbles After Mixing
Even with proper mixing, a small number of bubbles may still remain in the resin.
There are several effective ways to remove them.
Method 1. Let the Resin Rest
After mixing, let the resin sit for 3–5 minutes. During this time, some bubbles will naturally rise to the surface.
This method works especially well with low-viscosity resins such as ResinPro Trasparente.
Method 2. Use a Gas Torch
The most effective way to remove surface bubbles is by briefly applying a gas torch.
How to use it correctly:
- keep the flame 5–7 cm away from the surface;
- do not stay in one spot;
- move smoothly across the surface;
- repeat if necessary after a few minutes.
Heat causes bubbles to burst almost instantly.
Method 3. Use a Heat Gun
For some projects, a craft heat gun is very useful.
It helps remove surface bubbles and can also create beautiful artistic effects in resin.
Bubbles in Molds and Deep Castings
When working with silicone molds, bubbles can get trapped near the walls or decorative elements.
To avoid this:
- first apply a thin layer of resin with a brush to the mold surface;
- carefully spread resin into detailed areas;
- only then proceed with the main pour.
If you are working with dried flowers, wood, or other porous materials, it is recommended to pre-coat them with a thin layer of resin.
Which Resin Is Less Prone to Bubbles?
Resin viscosity also affects bubble formation.
For jewelry, dried flower casting, and transparent projects, ResinPro Trasparente (low viscosity resin) is ideal.
For trays, clocks, decorative plates, and design objects, ResinPro Art Pro (medium viscosity) is commonly used.
For ocean art, marble effects, space designs, and volumetric pours, ResinPro Deluxe (high viscosity) is recommended.
Frequently Asked Questions
Can bubbles be removed after resin has cured?
No. Once fully cured, bubbles remain inside the finished piece. That is why it is important to remove them immediately after pouring.
Why do new bubbles appear after heating?
This is usually caused by air trapped in porous materials or by resin continuing to release air during curing.
Can I use a regular household hairdryer?
A standard hairdryer is usually too weak and often just moves bubbles around. For resin work, a gas torch or a professional heat gun is recommended.
Achieving a perfectly clear, bubble-free finish is absolutely possible even for beginners. The key is maintaining proper temperature, mixing carefully, and using the right air-removal tools.