How to Remove Bubbles from Cured Epoxy?

Epoxy is the end result of the cured epoxy resins, which is the epoxide group’s formal name. It’s well defined as a class of  polymers that contain epoxide groups mainly used in DIY activities, crafts, jewelry, and many more,

Many Epoxy uses lie in the manufacture of adhesives, primers and sealers, paints, plastics, and most importantly, used for building and construction.

The construction range from airplanes’ manufacture, building bridges, and making strong joints in upcoming storied houses, among many.

Unfortunately, whether the artisan is experienced or not, bubbles may form in making crafts with resin. It mostly occurs when mixing the hardener and the resin, and this leaves one rather discouraged.

How to Prevent Bubbles in Resin?

Before we learn how to remove bubbles from cured Epoxy Resin, it’s important to know how to prevent them.

1. Work in the right temperature conditions

Working in cold temperatures makes the resin cold, which becomes difficult to work with. Working at room temperature will help produce optimal results and reduce the formation of bubbles.

Therefore, work with a temperature of 24-30 degrees centigrade, which helps the ArtResin epoxy resin have clear and attractive results.

Torching the cold-induced bubbles will hardly be torched out and, as such, take care of the temperatures used.

2. Reactions

Let’s take an instance where one wishes to mount the photo paper on the walls with a given adhesive. Unfortunately, a reaction occurs whose result is the formation of bubbles.

To prevent these bubbles from forming, pre-seal with a brush-on. This will generate a form of a barrier between the photo, and the adhesive and bubbles will not form during the crafting techniques.

Also read:  How Long Does Epoxy Last?

3. Off-Gassing

Off-gassing refers to how gas is released from materials such as wood, fabric, paper, mostly when there is moisture inside the material.

Whenever one uses such materials and covers them with epoxy resin, they tend to continue emitting some gases even after covering them.

This may take few hours to start emitting the air and lead to bubbles forming when curing is taking place.

This can be prevented by pre-sealing the materials before applying the resin. A spray sealant or a brush can work well in pre-sealing. Either way, use a thin coat of ArtResin even when you are using stronger materials such as wood.

However, even after taking the precautions mentioned here, one may find that bubbles are still forming. This does not have to kill one’s crafting career; there are ways to remove them.

This article will comprehensively explain how to remove the bubbles and get a crystal shiny, smooth and beautiful look of the end product, be it table tops, jewelry, art, or any other DIY work.

Tips to Remove Bubbles from Cured Epoxy


Once you realize that bubbles have formed, getting the solution to remove them in the already cured resin is the way out. Sanding helps in creating room to replace the bubbled area with fresh resin. It’s critical then to use good coarse sandpaper to remove the bubbled areas for a later refill.

Even though the surface may look scratched and unworthy, this should not be a course to worry about.

Use the ArtResin to fill the scratched areas, and the artwork will look beautiful once again, smooth without bubbles, and saleable.

Wiping the surface

Once the sanding exercise has taken place, it happens that the area may have some dust particles.  Wipe the dust using a wet paper towel. However, this may not work well for industrial production, but an air compressor can be used to blow out any dust particles that may be trapped in the piece.

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This will pave the way for creating a clean and smooth product once the new coat of epoxy resin is applied.

Fresh application

Take your time and mix the hardener with the resin. Avoid doing it hurriedly, as this may cause the mixture to have many bubbles, which may not solve the original problem.

Take 3 to 5 minutes to carefully mix the ArtResin.  Make a fresh application on the sanded area and torch out any bubbles that may appear in the course of the application. A toothpick will work out best to torch them out and spread the mixture evenly and carefully.

Wait for about 72 hours to cure the epoxy resin once again, and the result will look more beautiful than before.

Also read: UV Resin vs Epoxy Resin – Which One Is Better for You?

How to Mix Epoxy Resin without Bubbles?

Even with proper care, it may happen that bubbles still form when mixing epoxy resin. However, there are proven ways that one can mix epoxy resin without bubbles.

1. Choose the right epoxy for your needs- Not all epoxies are the same, and using the right epoxy when mixing the ingredients will help eliminate the formation of bubbles.

2. Using a utility lighter- This could be the most effective method, but care needs to be taken when using the flame near the resin. If you are an amateur in resin epoxy crafts, please do not try using this method unless you are conversant enough.

However, expose the resin for 1-3 seconds and allow it to cool for a few minutes before using it.

3. Once done, stir the resin, see if there are any bubbles visible, and blow them up before mixing. Use a straw or a toothpick to blow them. This will help in removing the bubbles, which are also stuck in the corners.

Also read:  Epoxy Primer in a Spray Can?

4. Mix the resin and the hardener, taking your time to get a quality mix.

Apply the mix to the piece and spread it evenly.

When this procedure is followed, the chances are that one can hardly get bubbles on the mix, and the entire procedure will be a smooth flow.

Also read: Can You Brush on Epoxy Resin?

Frequently Asked Questions

Q. How can one fix bubbles in a cured Epoxy Floor?

A.  By use of a sanding rotary scrubber in small areas can be of great help. However, a floor buffer works well and faster in case of sanding larger floors.

Q. How do you fix cured Resin?

A.  Whenever epoxies have already cured, there are bubbles in it, sand down the affected surface, and make a new application. Allow time to cure once again for a crystal clear piece.

Q. Why does resin Bubble?

A.  Most of the proven reasons resin keeps bubbling are failure to follow the correct procedures such as using the right temperatures, using too thick resin, and not allowing the trapped air to get out of the piece before making an application.

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