cloudy resin 3

Have you ever mixed a batch of art resin, poured it into your molds, and been disappointed when the clear result turned cloudy? This is an all-too-familiar issue for many resin users. While some cloudiness may be unavoidable due to environmental factors or misapplication of the product, there are often underlying causes that can cause issues with clarity. 

Resin art can turn cloudy due to one of these reasons – inappropriate mixing ratio (resin: hardener), contamination, over-pouring, air bubbles, and temperatures. It’s best to check contamination first and then add more hardener or sand the art.

In this post, we’ll explore five potential reasons why your artwork might turn cloudy and offer three solutions you can use to get back on track!

cloudy resin 2

5 Reasons Art Resin Is Cloudy

It can be frustrating to see that your art resin is gradually turning cloudy. Here are a few reasons for this incident to happen.

Improper mixing of the resin and hardener: 

Incorrect ratios of resin to the hardener can cause the resin to not cure properly, resulting in a cloudy finish. This is because when the incorrect ratio is used, there won’t be enough hardener to properly catalyze and cross-link with the resin molecules, leading to an incomplete chemistry reaction. It is important to use precise measurements and mix thoroughly for the best results. 


Resin should always be handled in a clean environment free from dust or dirt particles, as they can cause cloudiness. Ensuring that containers and tools are wiped down before use with rubbing alcohol, or soap will help prevent contamination. 


The curing time for resin may vary depending on temperature; if it is too hot or too cold, this can also lead to a cloudy finish. The optimal temperature range for most resins lies between 65°F – 75°F (18°C – 24°C), so try to keep your workspace around these temperatures while working with resin. 

Air bubbles: 

Air bubbles form easily in uncured resin due to the chemical reaction taking place during curing, which can lead to a hazy look in your artwork if not removed promptly. To avoid this, use a heat gun or torch on low power setting over the surface of your work after pouring it into molds/casting containers and gently move it around until any air bubbles rise up and are popped away. Make sure you take caution when using heat guns, as they get extremely hot!


Pour only as much resin into your molds/casting container as needed – too much will result in the airspace between layers, making them less likely to stick together due to trapped air pockets causing cloudiness in finished pieces.

Letting each layer sit for a few minutes before pouring another will also help. This will prevent trapped air bubbles from forming due to buckets being filled past their capacity from multiple pourings at once.

cloudy resin 1

How Do I Fix Cloudy Resin

If the resin has already cured and is still cloudy, there are a few things you can try to restore its clarity.

Sanding it

First, you can sand it down with fine-grit sandpaper, then buff it with a polishing compound. This process will help to remove any surface imperfections that may have caused the cloudiness. It’s important to be gentle while sanding and buffing. Too much pressure or friction, can cause scratching on the surface of the resin. 

Adding more hardener

You can also try mixing in a bit more hardener if the resin is still liquid. Be very careful not to mix in too much hardener though.

This could potentially cause brittleness, cracking, and other issues with the resin. You may want to consult an expert or manufacturer if you plan on attempting this approach. 

Check for contamination

It’s also important to avoid common causes of cloudiness when working with resin in the first place.

  • Make sure all your materials are clean and free from contaminants like dust and dirt.
  • Check that containers for mixing are properly labeled.
  • Measure out your materials accurately using calibrated tools like scales or measuring cups before combining them together.

Improperly mixed resins can lead to many problems like cloudiness that may require starting over from scratch if they cannot be fixed.


Why Is My Epoxy Cloudy When Mixing

Epoxy resin and hardener must be mixed together in the correct ratio for a successful application. It’s important to take precautions when using epoxy to prevent any issues, such as contamination, temperature, and air bubbles.

Contamination can cause epoxy to become cloudy if it comes into contact with dust, dirt, or other contaminants. It’s essential to ensure that your workspace is clean before beginning your project.

Temperature also affects the curing process of epoxy. If it is too cold, then the epoxy may not cure properly, resulting in a cloudy finish.

Lastly, air bubbles can become trapped in the epoxy as it cures, which can cause a cloudy appearance.

To avoid this, use a heat gun or torch to carefully pop any bubbles that form on the surface of the epoxy. Also make sure not to over-pour when mixing the resin and hardener together.

How To Fix Cloudy Resin After Sanding

Starting with 600-grit sandpaper, use long, even strokes to gently sand away any scratches or imperfections that may be causing it to look cloudy. Gradually work up to finer grades of paper, such as 1000 then 2000 grit, in order to achieve the best possible results.

After you’ve completed the sanding process, a polishing compound can be used to buff the resin until it has a smooth and glossy finish.

Depending on the material, you may need to apply multiple coats of polish in order for your resin piece to look its best. With these simple steps, your resin will once again look pristine and beautiful.

More Articles on Resin Art:

How To Make Resin Art with Dried Flowers

Can Art Resin Be Used For Casting

How To Sell Your Resin Art


Similar Posts