Originally written July 2016. Updated March 2020.
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.
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.
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.
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.
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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