How to Remove Bubbles from Resin – Complete Beginner Guide
Seeing bubbles in your resin project? Don't worry — this is one of the most common issues in resin art for beginners. The good news is bubbles are easy to remove — and even easier to prevent once you know the right steps.
This guide will help you remove bubbles from resin, understand why they form, and get a smooth, clear, glass-like finish every time.
Why Do Bubbles Form in Resin?
Before fixing the problem, it is important to understand the cause. Bubbles usually appear due to:
- Fast or rough mixing
- Cold temperature
- Thick resin layers
- Air trapped in materials like wood, paper, or flowers
Knowing this helps you prevent bubbles in future projects.
How to Remove Bubbles from Resin After Pouring
1. Use a Torch or Heat Gun (Best Method)
This is the most effective way to remove bubbles. Gently pass a torch or heat gun over the resin surface, keeping it moving at all times. Do not hold it in one place. Heat helps bubbles rise and pop quickly, giving you a smooth, professional finish.
Do not hold the torch too close or stay in one spot. Overheating can burn or yellow the resin surface.
2. Use a Toothpick or Pin
For small or stubborn bubbles, pop them manually using a toothpick. This is especially useful for corners and detailed areas such as jewellery moulds and small designs.
3. Let Bubbles Rise Naturally
Some bubbles disappear on their own. Wait a few minutes after pouring and many bubbles will rise and burst automatically. Always check the surface before curing.
How to Prevent Bubbles in Resin
Prevention is always better than fixing. Follow these steps every time.
1. Mix Resin Slowly
Fast mixing traps air inside resin. Instead, mix gently for 3–5 minutes and avoid whipping or shaking the mixture.
2. Work in a Warm Environment
Cold resin creates more bubbles. The ideal working temperature is 24–30°C. Warm resin flows better and releases bubbles much more easily.
3. Pour in Thin Layers
Thick pours trap bubbles deep inside where they are hard to remove. Pour in thin layers of around 1/8 inch and add layers gradually to build thickness.
4. Seal Porous Materials First
Materials like wood or paper release air as resin soaks in, causing bubbles from below. Apply a thin base coat of resin first, let it cure, and then pour the final layer on top.
5. Warm the Resin Bottles Before Mixing
Before mixing, place the resin and hardener bottles in warm water for 5–10 minutes. This reduces viscosity and helps the resin flow smoothly with fewer bubbles.
For thicker designs, pour in multiple thin layers with a gap of 3–5 hours between each pour. This gives you much better clarity and control.
Special Tips for UV Resin
UV resin behaves slightly differently from epoxy resin when it comes to bubbles.
Common bubble causes in UV resin:
- Thick layers
- Fast pouring
- Air trapped in moulds
How to fix:
- Use a toothpick to pop bubbles before curing
- Cure in thin layers
- Avoid overfilling moulds
UV resin needs extra care because of its quick curing time — you have very little time to remove bubbles before it sets.
Common Mistakes to Avoid
Overheating with the torch, mixing too fast, pouring very thick layers, and ignoring the working temperature are the most common causes of bubble problems in resin art.
- A torch or heat gun is the fastest and most effective way to remove bubbles
- Always mix resin slowly for 3–5 minutes to prevent air bubbles forming
- Work at 24–30°C for the best results
- Pour in thin layers rather than one thick pour
- Seal porous materials like wood before your final resin pour
Frequently Asked Questions
Why do bubbles keep coming back in resin?
This usually happens because of trapped air from fast mixing, cold temperature, or air releasing from porous materials underneath the resin.
Can bubbles disappear on their own?
Yes, small surface bubbles often rise and pop naturally within the first few minutes after pouring. Always check the surface before leaving it to cure.
Can I remove bubbles without a torch?
Yes. Use a toothpick to pop individual bubbles, let them settle naturally, or warm the resin bottles before mixing to reduce bubbles from the start.
Why is my resin cloudy with bubbles?
This usually happens due to cold working temperature or too many micro bubbles from fast mixing. Work in a warmer environment and mix more slowly next time.
How long after pouring can I remove bubbles?
You have around 30–45 minutes with epoxy resin before it starts to thicken. Remove bubbles within the first 10–15 minutes after pouring for best results.