Why Does Your Epoxy Resin Table Top Always Have Bubbles? 7 Common Causes Explained

❶ Introducing Air During Mixing

What it looks like: Lots of small bubbles across the surface, especially in corners or edges.
Cause: Fast stirring or using the wrong tool traps air in the resin mixture.
Fix it:

• Mix slowly (350–500 RPM) with a spiral mixer or Jiffy mixer

• Avoid lifting the mixer up and down

• Mix for 2–3 minutes steadily

❷ Pouring at Low Temperatures

What it looks like: Bubbles stay suspended and don’t rise or pop easily.
Cause: Cold resin is thick, making it harder for bubbles to escape.
Fix it:

• Warm the resin and hardener to room temperature (72–77°F or 22–25°C)

• Don’t work in cold environments (below 50°F or 10°C)

❸ Pouring Too Thick in One Layer

What it looks like: Large trapped bubbles or heat-crack patterns deep inside.
Cause: Thick pours cause excessive heat buildup, which expands trapped air.
Fix it:

• Pour in layers, each no more than 0.5–1 inch (1–2 cm)

• Allow each layer to partially cure before adding the next

❹ Unsealed or Porous Substrate

What it looks like: Bubbles appear mainly in wood grain or along edges.
Cause: Air escapes slowly from porous surfaces like raw wood.
Fix it:

• Seal the surface with a thin “seal coat” of resin first

• Ensure your surface is dry, clean, and dust-free

❺ Using Low-Quality Resin

What it looks like: Bubbling persists even when you follow all instructions.
Cause: Cheap or low-grade resin often has poor bubble-release properties.
Fix it:

• Choose resin designed for tabletops or art with self-leveling and bubble-release features

• Read reviews and check the manufacturer's specs

❻ Skipping Bubble Removal Tools

What it looks like: Bubbles rise but don’t burst, staying on the surface.
Cause: No heat or tools used to help bubbles break.
Fix it:

• Use a heat gun or torch to gently sweep the surface

• Let the mixed resin sit 5–10 minutes before pouring to release trapped air

❼ High Humidity in the Room

What it looks like: Cloudy finish, microbubbles, or orange-peel texture.
Cause: Moisture in the air interferes with resin curing and surface tension.
Fix it:

• Keep humidity under 60%

• Use a dehumidifier or air conditioner if needed

✅ Final Thoughts

Bubbles can be frustrating, but they’re usually preventable. With the right mixing method, proper environment, and quality materials, you can create a smooth, glass-like epoxy resin surface. Check your process against these 7 points, and your next resin tabletop will be bubble-free and beautifully clear!