How to fix bubbles in resin – remove bubbles from cured resin

 

How to fix bubbles in resinOriginally written July 2016.  Updated March 2020.

by Kate Ledum

Even when you are very careful and very experienced, you may find yourself in a situation where you are asking yourself how to fix bubbles in resin — even if the resin is completely cured.

Unfortunately, the resin coaster with leaves from the How to Make a Resin coaster tutorial ended up with a few large bubbles.

What happened to trap bubbles in the resin?

Because the leaves were slightly cupped on the bottom, it made it easier to trap bubbles underneath.  I should have looked under the mold while I was putting them in.

Bubbles can also form in resin after you add your charms and other items, especially if the air in the room is chilly.  I live in British Columbia, Canada, and it was a bit cool when I made these coasters.

How to fix bubbles in resin

In this case, the bubbles occurred on what will be the bottom of the resin coaster, so they will be easy to deal with.

Step 1

cutting bubbles out of resin

With a sharp knife, cut around the bubbles so they’re open and can be filled like small molds. Opening them up like this makes them easier to fill.

Step 2

Mix up another small batch of resin. Make no less than the minimum recommended by the instructions that came with the resin. 3/4 – 1 ounce should be enough.

Step 3

fill bubbles with more resin

Put your resin piece onto a curing rack. The curing rack has bumps to elevate the curing piece. If there are any drips off the side, it won’t pool under the coaster, which is the front, and ruin it completely.


Step 4

add resin to holes created by bubbles

Using the stir stick, carefully fill each bubble hole. When it cures, the resin will bond completely and the hole will magically disappear.



Since the bottom of the coaster has a matte finish, and the hole repairs have a shiny finish, we should make the whole bottom shiny to further hide the former bubbles. After filling the holes, coat the whole surface with a thin layer of the resin, much like a glaze. We’re not trying to create a dome, just to cover the whole surface with wet resin.

As an added benefit, the shiny finish on the bottom will also make the finished coaster look ‘clearer’ from the top as well.

See the finished results in the tutorial How to Make a resin coaster.

If you want more tips on how to prevent bubbles in resin, here’s a great resource for you:  10 tips for getting rid of resin bubbles.

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16 thoughts on “How to fix bubbles in resin – remove bubbles from cured resin

  1. Thanks for this article! I know bubbles can make me crazy when I am working on a resin piece with photographs in them since who wants bubbles on a photo.

  2. i fan a propane torch over the bubbles to heat the gas within them to expand the bubbles to their bursting point. keep in mind to always keep the torch moving. stopping over a bubble will burn the clearcast. keep the torch moving over the surface and watch them disappear.

  3. My name is Rob , I made a plaque with a picture In it, and after a few months, The picture has a bubble In it. How can I get rid of it ? I used a 2 part bar finish.

  4. I recently fixed some air bubbles in a resin glass picture by using a needle to “pop” the bubble the pouring a slight coat of resin over the picture again. I also saw a tip about lightly spraying acetone over the picture to bring up and pop any bubbles – I have to admit using both of these methods gave me the best result I have ever had with working with resin and having no bubbles.

  5. Hi Katherine, I hope this doesn’t sound odd but I need bubbles in my resin. As I read comments, I’m assuming I can get some bubbles by doing the opposite of the suggestions? Thx. DN

    1. Hi Dani, yes you can! The easiest way to get bubbles in your resin is to wait until the resin starts to get thick, then whip it like you are making scrambled eggs. 😉

  6. Hello Katherine, I made a round coaster and after it cured and I took it out of the mold the top had a crack in it (uneven surface). What did I do wrong and can I pour more resin on the top to even it out?

    1. Hi Jeanne, it’s hard for me to say why there was a crack in the coaster without seeing it, but it sounds like something you can repair with another layer of resin.

  7. Hi Katherine,

    I recently complete a garden ornament using epoxy resin.  Every this was fine after 3 day since completion and the resin appeared to have cured however, when I looked at it this morning a huge bubble had appeared under the surface.  Do you know what could have caused this and how to correct it?  I have before and after photos uf needed.

    Many thanks

    1. Hi Andy, I’m sorry this happened to you. It sounds like there was trapped air within the garden ornament that released after curing. I’m afraid there isn’t a way to correct it. You will need to remove the resin and try again. 🙁

      1. Thanks Katherine,

        Would it be possible to drill down through the top layer and into the bubble and the pour a thin lay layer over the top?

  8. hi there – i made a beautiful bangle with flowers from my garden. However the flower centre bells in a couple made a bubble hole on the outside of the bangle. I am planning to fill them by putting the bangle in a vice at the correct angle so that there is no overflow. BUT how do I smooth it all off at the end? I cant do a total pour coat over it all..

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