Resin Crafts Guru

How to Get Bubbles Out of Resin (7 Proven Methods)

February 13, 2026 · 9 min read

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How to Get Bubbles Out of Resin (7 Proven Methods)

You just poured your resin and it’s full of tiny bubbles. They make your piece look cloudy instead of crystal clear. Don’t worry. Most bubbles are easy to remove if you act fast.

This guide shows you 7 proven methods to get bubbles out of resin. You’ll also learn why bubbles form and how to prevent them on your next project.

Why Bubbles Form in Resin

Understanding why bubbles appear helps you prevent them. Here are the main causes.

Vigorous mixing. When you stir too fast, you whip air into the resin like beating eggs. Those air pockets become bubbles.

Cold resin. Thick, cold resin traps air. Room temperature resin (75-80°F) is thinner, so bubbles rise to the surface and pop naturally.

Porous materials. Wood, dried flowers, paper, and fabric absorb resin. As resin soaks in, it pushes air out. That air turns into bubbles around your embedded objects.

Pouring from height. When you pour resin from 6+ inches above your mold, the impact creates bubbles. Pour close to the surface instead.

Dirty or wet surfaces. Moisture on your mold or embedded items turns to steam bubbles. Dust particles also trap air pockets.

Temperature shock. Pouring warm resin into a cold mold creates tiny bubbles as the resin contracts.

Now let’s fix those bubbles.

Method 1: Heat Gun or Torch (The Gold Standard)

This is the fastest and most effective method. Heat makes bubbles rise and pop.

What you need:

  • Heat gun{rel=“nofollow sponsored”} or kitchen torch
  • 30-60 seconds per project

How to do it:

  1. Pour your resin into the mold
  2. Wait 2-3 minutes for initial settling
  3. Hold your heat gun or torch 6-8 inches above the surface
  4. Move it slowly back and forth in sweeping motions
  5. Don’t hold it in one spot (you’ll create dimples or scorch marks)
  6. Watch bubbles rise and pop
  7. Repeat after 10 minutes if new bubbles appear

Why it works: Heat reduces the surface tension of resin. Bubbles expand from the warmth and rise faster. When they reach the surface, they pop easily.

Pro tips:

  • A heat gun gives you better control than a torch
  • Keep the heat source moving constantly
  • Don’t overheat—you’ll yellow the resin or create new problems
  • Works on 90% of bubble issues

Best for: Flat pours, coasters, trays, jewelry pieces, and most projects.

Method 2: Warm Your Resin Before Mixing

Prevention is better than cure. Warm resin creates fewer bubbles.

What you need:

  • Bowl of warm water
  • 10 minutes prep time

How to do it:

  1. Fill a bowl with warm (not hot) water—around 100-110°F
  2. Place sealed resin and hardener bottles in the water
  3. Wait 10 minutes
  4. Remove bottles, dry them off
  5. Mix as normal

Why it works: Warm resin has lower viscosity. It’s thinner and flows better. Air escapes more easily during mixing. Bubbles rise to the surface faster after pouring.

Important: Don’t microwave resin bottles. Uneven heating can damage the resin. Warm water is safer and more effective.

Best for: Anyone working in a cold room or with resin that’s been stored in a cool place.

Method 3: Rubbing Alcohol Spray

This old-school trick still works great for surface bubbles.

What you need:

How to do it:

  1. Pour your resin
  2. Use a heat gun first to remove most bubbles
  3. Spray a very light mist of alcohol over the surface
  4. Watch bubbles pop instantly
  5. Use sparingly—one quick spray is enough

Why it works: Alcohol breaks the surface tension of resin. Bubbles can’t maintain their structure and they pop. The alcohol evaporates in seconds without affecting cure.

Warnings:

  • Don’t overspray—too much alcohol creates cloudy spots
  • Only works on surface bubbles, not embedded ones
  • Use after heat gun, not instead of it

Best for: Stubborn surface bubbles that survived the heat gun treatment.

Method 4: Let Your Mix Rest

Give your resin time to de-gas naturally before pouring.

What you need:

  • 3-5 minutes of patience
  • Timer

How to do it:

  1. Mix your resin thoroughly
  2. Set the mixing cup down
  3. Wait 3-5 minutes without touching it
  4. Watch bubbles rise to the surface
  5. Pour gently into your mold

Why it works: Mixing creates bubbles. Letting the mixture rest gives those bubbles time to rise and pop before you pour. You start with cleaner resin.

Trade-off: Your working time shortens. If your resin has a 30-minute pot life, you lose 5 minutes. Plan accordingly.

Best for: Projects where you have extra working time and want the clearest possible result.

Method 5: Toothpick Method for Stubborn Bubbles

Some bubbles hide in corners or cling to embedded objects. Go after them manually.

What you need:

  • Toothpick or thin skewer
  • Steady hand
  • Good lighting

How to do it:

  1. Locate stubborn bubbles that survived heat treatment
  2. Drag a toothpick through the bubble
  3. The bubble pops and resin self-levels
  4. Work gently to avoid creating new disturbances

Why it works: You’re physically breaking the bubble wall. Resin flows into the gap immediately.

Best for: Small bubbles around dried flowers, bezels, or in tight corners. Detail work after heat gun treatment.

Method 6: Pressure Pot (Advanced)

Serious resin crafters use pressure pots to eliminate all bubbles.

What you need:

  • Paint pressure pot{rel=“nofollow sponsored”} (2-3 gallon size)
  • Air compressor
  • $100-$200 investment

How to do it:

  1. Pour your resin as normal
  2. Place the mold in the pressure pot
  3. Seal and pressurize to 40-60 PSI
  4. Leave pressurized for 30-60 minutes
  5. Release pressure slowly
  6. Remove completely bubble-free piece

Why it works: Pressure compresses bubbles to microscopic size. They become invisible to the naked eye. The resin appears crystal clear.

Is it worth it? Only if you’re selling resin products or doing professional work. For hobbyists, a heat gun handles 99% of bubble problems.

Best for: Professional-level clarity. River tables. Large pours. Commercial production.

Method 7: Vacuum Chamber (Also Advanced)

A vacuum chamber pulls air out before you pour.

What you need:

  • Vacuum chamber and pump
  • $150-$300 investment

How to do it:

  1. Mix your resin
  2. Place mixing cup in vacuum chamber
  3. Seal and run vacuum for 2-3 minutes
  4. Watch bubbles foam up and collapse
  5. Release vacuum
  6. Pour de-gassed resin into mold

Why it works: Vacuum pulls air out of the resin before you pour. You start with bubble-free resin.

Drawback: Resin can foam over if you pull too much vacuum. You need the right-sized chamber for your batch size.

Best for: Professional work. Large batches. Projects where you can’t use heat on the finished surface.

Preventing Bubbles: Best Practices

Stop bubbles before they start. Follow these rules.

Mix Slowly and Deliberately

Stir like you’re mixing honey, not whisking eggs. Slow figure-8 patterns. Scrape the sides and bottom constantly. Fast mixing = more bubbles. Take 3 full minutes to mix.

Warm Your Workspace

Work at 75-80°F. Warm resin flows better and releases air more easily. If your workspace is cold, use a space heater.

Pour Close to the Surface

Hold your mixing cup 2-3 inches above the mold. A thin stream from low height creates fewer bubbles than a thick stream from high up.

Dry Everything Completely

Moisture creates steam bubbles. Make sure your mold, tools, and any embedded items are bone dry. Use a heat gun to dry flowers or wood before embedding.

Seal Porous Materials First

Wood, paper, and dried flowers need a seal coat. Brush a thin layer of resin on porous items. Let it cure. Then embed them in your main pour. This prevents air from escaping into your fresh resin.

Don’t Skip the Heat Gun

Even if you did everything right, run a heat gun over your pour. It takes 30 seconds and removes 90% of remaining bubbles. This is your safety net.

Bubbles in Specific Situations

Bubbles Around Dried Flowers

Flowers are full of air pockets. Here’s how to handle them:

  1. Seal flowers with a light resin coat 24 hours before your main pour
  2. Pour your first layer and cure it
  3. Place sealed flowers on the cured layer
  4. Pour the next layer slowly around the flowers
  5. Use a toothpick to pop bubbles immediately around petals
  6. Finish with a heat gun

Bubbles in Deep Pours

Thick layers trap bubbles. For pours over 1/4 inch:

  1. Use deep pour resin (it cures slower with less heat)
  2. Pour in 1/4 inch layers
  3. Heat gun each layer
  4. Wait 3-4 hours between layers
  5. Bubbles from lower layers can rise through fresh resin

Bubbles in Domed Pieces

Domes magnify bubbles. They need extra attention:

  1. Heat gun immediately after pouring
  2. Check again after 5 minutes—new bubbles often appear
  3. Heat gun a second time
  4. Use the alcohol spray method for any remaining surface bubbles

What If Bubbles Are Already Cured?

You poured yesterday and now you see bubbles trapped in your cured piece. Can you fix it?

Small surface bubbles: Sand them out. Start with 220-grit wet/dry sandpaper. Work up through 400, 600, 1000, and 2000 grit. Polish with plastic polish. The bubbles disappear and you restore clarity.

Internal bubbles: You can’t remove bubbles inside cured resin. They’re permanent. Your options:

  • Make it a design feature (add glitter or pigment to hide them)
  • Cut the piece apart and reuse the clear sections
  • Start over

This is why the heat gun is so important. Fix bubbles while the resin is liquid.

Common Questions About Resin Bubbles

Do all bubbles rise to the surface? Most do, but not all. Tiny bubbles in thick resin might get trapped. Bubbles around embedded objects sometimes stick to the item. Use a heat gun to help stubborn bubbles rise.

How long do I have to remove bubbles? You have until the resin starts to gel—usually 20-40 minutes after pouring. Once resin thickens, bubbles can’t rise anymore. Work fast.

Can you use a hair dryer instead of a heat gun? Hair dryers don’t get hot enough. They also blow air, which can disturb your pour and create ripples. Spend $25 on a proper heat gun.

Why do new bubbles keep appearing? Porous materials continue releasing air for several minutes after you pour. Embedded items with air pockets slowly de-gas. This is normal. Heat gun again at 5 minutes and 10 minutes.

Are tiny bubbles okay? Depends on your standards. For gifts and personal projects, a few micro-bubbles are fine. For pieces you’re selling, aim for zero visible bubbles. Use the pressure pot method if you need perfection.

Next Steps: Master Resin Troubleshooting

Bubbles are just one challenge you’ll face. Learn to solve every common resin problem in our Complete Resin Troubleshooting Guide.

If bubbles keep appearing because your resin won’t cure properly, read our guide on fixing sticky resin to understand curing problems.

The key to bubble-free resin is simple: warm your resin, mix slowly, pour low, and heat gun immediately. Follow those four steps and your pieces will be crystal clear every time.