Moisture in Resin Post-Curing: How to Prevent and Fix It

Moisture in Resin Post-Curing: How to Prevent and Fix It

Jun 16, 2024

Resin art has become extremely popular because of its versatility and stunning visual effects. However, it's important to understand that the post-curing process is critical to maintaining the quality and durability of resin creations.

Understanding how moisture affects the curing process is essential for resin artists and enthusiasts to ensure optimal quality. By learning to identify signs of moisture contamination, you can take preventive measures to minimise its impact on your artwork.

If you're interested in gaining practical experience and learning more about resin arts and crafts, consider joining a resin art workshop for an excellent opportunity to enhance your skills and learn how to fix the issue of moisture in resin post-curing.

In this blog, we will cover the effects of moisture in resin post-curing and discuss ways to identify and prevent this issue. Moisture-related problems are common during the post-curing stage, as inadequate handling or storage can lead to moisture contamination in the cured resin.

Why is Post-Curing Important?

Post-curing is an essential step for various types of resin, including polyester and epoxy resin. It involves subjecting the cured resin to heat or UV light for a specific period of time. The main reasons why post-curing is important are:

  • Enhancing Strength: Post-curing significantly increases the strength of the resin, making it more resistant to impacts and wear.
  • Improving Stability: Resin artworks that have undergone proper post-curing are less likely to warp or deform over time.
  • Reducing Yellowing: Certain types of resin, such as epoxy resin, tend to be yellow when exposed to UV light. Post-curing helps minimise this effect, keeping the artwork looking clear and vibrant for longer.

Understanding the Impact of Moisture in Resin Post-Curing

Moisture can be a major problem during the post-curing process, leading to various issues that can affect the appearance and integrity of resin artworks. Here are some common problems caused by moisture:

  • Greasy Prints: Moisture can make the surface of cured resin objects greasy, ruining their appearance and texture.
  • Sticking of Resin Coasters: If moisture isn't controlled properly during post-curing, resin coasters may stick to cold glasses, making them unusable.
  • Cloudiness in Cured Resin: Absorbed moisture can make the cured resin look cloudy or hazy, reducing its transparency and visual appeal. This is similar to the impact of moisture on clear glazes in ceramics.

Understanding these challenges is crucial for resin artists who want to create flawless artwork. By being aware of the potential problems caused by moisture in post-curing, they can take proactive measures to prevent or address them effectively.

Factors Affecting Moisture Levels in Resin Post-Curing

Several factors affect the moisture levels and quality of cured resin products during post-curing. Proper understanding and controlling of these factors are crucial for achieving optimal results.

1. The Role of Humidity

Humidity levels significantly impact the resin curing process. Higher humidity can cause more moisture to be absorbed during post-curing, leading to problems like cloudiness or haziness on the cured surfaces.

2. Ideal Humidity and Temperature Ranges

Maintaining the right humidity and temperature is essential for successful resin post-curing:

  • Recommended humidity level: below 40%
  • Recommended temperature range: 70-80°F (21-27°C)

3. Understanding Condensation

Condensation can happen when the resin surface gets colder than the dew point of the surrounding air. This can result in moisture building up on the cured resin surfaces, causing various moisture-related issues. It's important to control this aspect properly, especially when setting up a curing chamber.

4. External Factors and Air Circulation

During post-curing, proper air circulation is essential to prevent excessive moisture buildup on cured resin surfaces. Insufficient air circulation can trap moisture around the resin objects, leading to potential problems with the final curing result. Understanding and implementing appropriate techniques can help ensure successful outcomes.

By effectively managing and controlling these factors, you can minimise moisture-related issues during the post-curing stage of resin projects.

Effective Solutions to Prevent and Fix Moisture Problems in Resin Post-Curing

There are several effective solutions to consider when it comes to preventing and fixing moisture-related issues in resin post-curing. These solutions can help create a protective barrier against moisture absorption and ensure the longevity of your cured resin products. Let's explore some of these solutions:

1. Using Surfactant Films

Surfactant films are thin layers that can be applied to the surface of your resin before post-curing. These films act as a protective barrier, preventing moisture from seeping into the resin during the curing process. Surface surfactant films reduce the risk of moisture-related issues, such as cloudiness or haziness in the cured resin, by creating a hydrophobic surface.

2. Applying Clear Gloss Finish/Sealer

Another effective solution is to apply a clear gloss finish or sealer to your cured resin surfaces. This additional layer acts as a protective coating against moisture, providing an extra level of defence. The clear gloss finish or sealer helps to seal the resin, preventing moisture from penetrating and causing any potential damage. It also enhances the shine and appearance of your resin art.

3. Applying Food-Grade Silicone Spray

For functional resin items like coasters or trays that come into contact with food or liquids, applying a food-grade silicone spray can provide an additional layer of protection against moisture-related issues. The silicone spray creates a water-resistant surface, preventing any potential damage caused by moisture absorption.

By implementing these solutions and methods, you can significantly reduce the risk of moisture problems in resin post-curing. Experimenting with different preventive techniques and finding what works best for your specific resin projects is important. Remember, taking proactive steps to address moisture concerns will ensure high-quality outcomes and enhance the longevity of your resin creations.


Proactively addressing moisture concerns during the post-curing process is important to achieve high-quality resin outcomes. By understanding how moisture affects resin post-curing and taking necessary preventive measures, you can effectively prevent and resolve moisture-related issues.

Remember, prevention is always better than cure when dealing with moisture-related problems in resin art. By actively addressing moisture issues in resin post-curing, you can ensure that your finished products are free from greasy prints, sticking coasters, and cloudiness caused by excess moisture. Take control of your resin projects and unlock their full potential by implementing effective preventive measures against moisture-related problems.

If you want to learn more about resin arts and crafts, Contact Us on Arts Shala for expert guidance, allowing you to refine your skills and create stunning resin masterpieces confidently. Keep creating and exploring new possibilities with resin art!
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