Cloudy Epoxy Resin: How to Fix It?

Cloudy Epoxy Resin: How to Fix It?

Liquid resin should ideally be completely transparent. It should not have any white flakes at the bottom or a cloudy appearance. If your resin is not crystal clear, it doesn't mean it is ruined. In this article, we will explore how to fix this issue. Additionally, resin can also become cloudy even after it has fully cured, which we will discuss later on.

Causes of Clouding in Liquid Resin

Liquid resin is susceptible to a process called crystallization, which can occur at low temperatures or due to temperature fluctuations. This process leads to the resin becoming cloudy and the formation of white flakes at the bottom. Crystallization is actually a sign of high-quality resin but working with crystallized resin is not feasible. To rectify this, you need to reverse the process and restore the resin to its original crystal-clear state. Failing to do so may result in the epoxy resin not curing properly.

What to Do with Cloudy Resin?

INSTRUCTION for heating the resin:

Heat the resin for approximately 30 minutes using one of the following options:

Option 1: Place the resin container in a warm water bath with a temperature range of 100-120°F (38-49°C). Ensure that the water level is below the resin cap to prevent water contamination.

Option 2: Use a heat gun or a hairdryer on a low heat setting and gently warm the surface of the resin container. Keep the heat source at a safe distance to avoid overheating.
Heating the resin helps to reduce its viscosity and eliminate any cloudiness caused by crystallization. It is important to note that excessive heat or prolonged exposure to high temperatures can negatively affect the resin's properties, so it is essential to follow the recommended temperature ranges and exercise caution during the heating process.

After heating the resin, allow it to cool down to room temperature. In this case, the resin will regain its fluidity, making it easier to work with while preserving its original characteristics.

Finally, proceed to mix the resin with the hardener according to the instructions provided by the manufacturer. The specific mixing ratios may vary depending on the type of resin being used. Follow the recommended proportions carefully to ensure proper curing and optimal results.

Causes of Clouding in Cured Resin

  1. Cloudy Mold Surface If the mold you used for resin casting has a cloudy surface, the same cloudiness will transfer to your final piece as the resin replicates the mold's surface. Before pouring resin into the mold, ensure that its walls are smooth and glossy as it will affect the final result. Utilize special silicone molds that leave no cloudy streaks on your piece and maintain the resin's crystal clarity.

  2. Cold Resin If the resin is too cold, certain components may start to crystallize, as mentioned earlier. These crystals will appear as gray or white streaks in the resin. To prevent resin from clouding, store it in a thermally stable environment, such as the bottom of a dark cabinet.

  3. Introduction of Water into the Mixture Adding water to the resin mixture will cause streaks to appear. Even a small droplet can spoil your creations. Take care to avoid water contamination in the resin and monitor the humidity levels in the workspace, ensuring they do not exceed 50%. Another way moisture can enter the piece is through improperly dried dried flowers or other organic fillers. Before adding resin, thoroughly dry all items. If you are using glue or acrylic paints, make sure they are also fully dried. You can use a construction hairdryer to speed up the drying process or allow them to dry naturally over several hours to days.

How to Fix Cloudy Resin Pieces

  1. First, determine if the cloudiness is only on the surface or throughout the casting.

  2. If the top layer of your piece is cloudy, you can try the following options:

    Option 1: Apply a fresh layer of epoxy resin to the surface. Use a brush to apply it over the cloudy resin and allow it time to cure.

    Option 2: Sand and polish the surface of the piece. This method can yield excellent results in fixing streaks on the surface but requires additional time and effort. However, if the cloudiness extends beyond just the surface and permeates the entire piece, there is unfortunately no way to fix the clouding of fully cured resin. The best you can do is prevent such a outcome in the future when mixing and pouring resin.

In conclusion

To ensure your resin piece is crystal clear after curing, follow these guidelines:

  1. Make sure your additives are completely dry before adding them to the resin.

  2. Pre-heat the resin kit before using it. This will dissolve any crystals that may have formed due to cold resin.

  3. Thoroughly mix the resin and hardener before using. Inadequate mixing can result in the appearance of cloudy streaks on the resin.

By following these rules, you can increase the chances of achieving a perfectly clear and transparent resin piece.

Back to blog

Leave a comment

Please note, comments need to be approved before they are published.