Understanding Fogginess and Milkiness in Clear Resin Coating

Understanding Fogginess and Milkiness in Clear Resin Coating

Jun 07, 2024

Have you ever applied a clear resin coating, only to be disappointed by a cloudy or milky finish? This frustrating phenomenon can ruin the aesthetic of your project. But fear not! This blog is all about fogginess and milkiness in clear resin coatings, equipping you with the knowledge to achieve a crystal-clear finish.

We'll explore the various causes behind these imperfections, from improper application techniques to environmental factors. By understanding the science behind the cloudiness, you'll be able to identify the culprit and take preventative measures. This blog will also equip you with troubleshooting tips. We'll discuss methods to potentially salvage a cloudy or milky coating, as well as strategies to ensure a perfectly clear finish in future projects. To learn this topic by professionals, enrol in a resin art workshop

Reasons Behind Fogginess and Milkiness in Clear Resin Coating

A clear resin coating should, well, be clear! But sometimes, what's supposed to be transparent ends up looking cloudy or milky. This can be incredibly frustrating, especially after putting time and effort into your project. Here's a breakdown of the common reasons behind this hazy situation:

  • Moisture Contamination: One of the most common reasons for fogginess and milkiness in clear resin coatings is moisture contamination. When resin comes into contact with moisture, it can cause a chemical reaction that results in a cloudy appearance.
  • Improper Mixing: Properly mixing the resin and hardener is crucial for achieving a clear finish. If the resin and hardener are not mixed thoroughly, it can result in fogginess and milkiness.
  • Incorrect Temperature: Working in extreme temperatures can also affect the clarity of your resin coating. It is important to work in a temperature-controlled environment to prevent fogginess and milkiness.
  • Using Low-Quality Resin: Using low-quality resin can also lead to fogginess and milkiness in your clear coating. It is essential to invest in high-quality resin to achieve a flawless finish.
  • Changes in Humidity Levels: When the humidity is too high, moisture can become trapped in the resin, leading to a cloudy or milky appearance once the coating has cured

How to Prevent Fogginess and Milkiness in Clear Resin Coating?

Now that you understand the common causes of fogginess and milkiness in clear resin coating, let's explore some tips to prevent this issue and achieve a flawless finish:

  • Use a Digital Scale: To ensure accurate mixing ratios, invest in a digital scale for precise measurements of the resin and hardener. This will help you achieve a proper chemical reaction and prevent fogginess in the final result.
  • Degassing: Before pouring the resin mixture, degassing can help remove any trapped air bubbles that can contribute to a cloudy finish. Use a heat gun or torch to gently remove the bubbles and ensure a smooth application.
  • Environmental Conditions: Work in a clean and dry environment with moderate temperature and humidity levels to prevent moisture contamination. Avoid working near open windows or doors and keep water sources away from the work area.
  • Proper Curing Time: Allow the resin to cure for the recommended time specified by the manufacturer. Avoid touching or disturbing the resin during the curing process to ensure a clear and blemish-free finish.

By following these tips and best practices, you can prevent fogginess and milkiness in your clear resin coating and achieve professional-looking results every time.

What to Do Once It Happened?

If you encounter fogginess or milkiness in your clear resin coating, don't panic. There are several steps you can take to rectify the issue and achieve a crystal-clear finish:

  • Identify the Cause: First, determine what may have caused the fogginess or milkiness in your resin coating. Was the resin and hardener properly mixed? Was there moisture present during the curing process? Understanding the root cause will help you address the issue effectively.
  • Sanding and Buffing: If the fogginess or milkiness is minimal, you may be able to remedy the issue by sanding and buffing the surface of the resin coating. Use a fine-grit sandpaper to gently remove the cloudy layer, then polish the surface to restore its shine.
  • Recoating: In more severe cases of fogginess or milkiness, you may need to recoat the surface with a fresh layer of clear resin. Make sure to follow the manufacturer's instructions carefully to ensure proper mixing and application.
  • Preventative Measures: To avoid fogginess and milkiness in future projects, take preventative measures such as using high-quality resin and hardener, working in a clean and dry environment, and following proper curing techniques. Properly sealing the surface after curing can also help maintain clarity and durability.

Pro Tips for Fixing Foggy and Milky Resin Coatings

While prevention is always best, here are some pro tips you can try to potentially salvage your project:

  • Heat Treatment (Risky): This is a gamble. Applying gentle, controlled heat (think hairdryer on low setting) might help disperse trapped moisture or air bubbles causing cloudiness. However, excess heat can also damage the resin. Proceed with extreme caution and only on a small, inconspicuous area first.
  • For a Slightly Hazy Finish: Once the resin is completely cured, very fine-grit sandpaper (like 1200 grit or higher) and polishing compound can be used to buff away minor cloudiness on the surface. This approach is best for minimal imperfections and requires a delicate touch to avoid damaging the resin further.
  • For Experienced Crafters Only: This is an advanced technique and not recommended for beginners. In some cases, professionals might attempt to add a very thin layer of fresh, clear resin onto the existing cloudy layer. However, improper application can worsen the situation. It's crucial to ensure the original layer is fully cured and the new layer bonds properly.
  • Start Over: If the cloudiness is significant and can't be salvaged, it might be best to accept defeat and start over. This is especially true for critical projects where a clear finish is essential.


Understanding the causes of fogginess and milkiness in clear resin coating is essential for achieving a flawless finish in your projects. By following proper preparation techniques, adhering to recommended mixing ratios, and taking preventative measures, you can minimise the risk of these imperfections. In the event that fogginess or milkiness does occur, take prompt action to address the issue and restore the clarity of your resin coating.

Next time you embark on a clear resin project, keep these tips in mind to maintain the transparency and beauty of your finished creation. To learn more such tips and tricks, make sure to visit Arts Shala’s website. Contact Us for more information!
Back to blog