Mixing Resin Batches: Challenges & Best Practices

Mixing Resin Batches: Challenges & Best Practices

Jun 12, 2024

When it comes to resin arts and crafts, measuring and mixing resin correctly is crucial for the success of your projects. Mixing resin batches requires precision and attention to detail to ensure a seamless outcome. Failure to do so can lead to a range of issues that affect the curing process and the overall quality of your work. Additionally, consider joining a resin art workshop to gain hands-on experience and valuable insights into measuring and mixing resin correctly.

In this blog, we will discuss whether mixing and pouring two resin batches in the same project is possible. We'll explore the potential challenges and provide guidelines on executing this process effectively while minimising any negative effects. So, let’s get started!

The Basics of Resin Mixing

To achieve successful resin projects, it is crucial to understand the basics of resin mixing. Following the correct ratio and stirring technique, working in a clean environment, and calculating the right amount of resin and hardener are essential for consistent results.

Understanding the Importance of Ratio and Stirring Technique

Resin mixing involves combining two components: the resin and the hardener. Following the resin manufacturer's instructions regarding the ratio of resin to hardener is vital. This ratio ensures proper curing and maximises the strength and durability of the final product. Deviating from the recommended ratio can result in poor curing or a tacky surface.

Stirring is another critical aspect of resin mixing. Proper stirring ensures that the resin and hardener are thoroughly combined, eliminating any streaks or inconsistencies in the mixture. It is recommended to stir slowly and deliberately, scratching the sides and bottom of the container to ensure all components are evenly mixed.

Working in a Clean and Controlled Environment

Maintaining a clean and controlled environment during resin mixing is essential to prevent contamination. Dust, debris, or foreign particles can affect the final appearance of your project. It is advisable to work in a well-ventilated area away from pets, excessive humidity, or direct sunlight.

Using clean tools and containers is crucial to avoid introducing impurities into your mixture. Even small traces of dirt or moisture can affect the curing process. Regularly inspecting your tools for cleanliness and ensuring they are residue-free will help you achieve optimal results.

Calculating the Right Amount of Resin

Calculating the appropriate amount of resin and hardener for your mould or surface area ensures minimal wastage and sufficient coverage. Most resin manufacturers provide guidelines on how much material is needed based on volume or weight. It is essential to measure both components carefully using accurate scales or measuring cups.

Considering any additional factors, such as the desired thickness of the resin layer or any embellishments you plan to add, can help you determine the necessary amount. Calculating accurately minimises the risk of running out of resin mid-project or having excess material that goes to waste.

Can You Mix and Pour Two Resin Batches in the Same Project?

When considering mixing and pouring two resin batches within the same project, it's essential to evaluate the compatibility of the resin batches and establish clear guidelines for the mixing process. Here are some key points to consider:

Compatibility of Resin Batches

  • Factors to consider include the properties of each resin batch. Ensure that both batches have similar properties, such as viscosity and curing times, to minimise potential issues during the mixing and curing. Using resin products from the same manufacturer is advisable for better compatibility.

Guidelines for Mixing

  • Plan and prepare a detailed timeline for your project, considering each resin batch's specific requirements. This includes understanding the resin's working time or pot life to ensure efficient execution during multiple pours.
  • Work efficiently to minimise delays between mixing and pouring each batch, as prolonged delays can affect the overall project outcome.

Mixing and Pouring Resin Batches: Challenges and Best Approaches

When mixing different resin batches in a single project, there are potential risks and impacts on the final results that must be carefully considered. Some challenges include the risk of visible seams or inconsistencies in colour and haziness, milkiness resin texture. To address these challenges, here are some tips for successfully combining two batches while minimising these risks:

Thorough Mixing

Ensure that each resin batch is mixed thoroughly and consistently according to the manufacturer's recommendations, as outlined in this guide on measuring and mixing epoxy resins. This helps maintain uniform properties and minimises the risk of visible seams or differences in texture.

Compatible Formulas

Use resin batches with similar properties and characteristics, such as viscosity and curing times, to minimise the risk of incompatibility when they are mixed. The basic instructions for resin and hardeners provided by manufacturers can guide you in achieving compatibility.

Colour Consistency

If colour matching is essential for your project, consider mixing sufficient pigments or dyes into each batch separately before combining them.

By following these best approaches, you can mitigate the challenges associated with mixing and pouring resin batches in the same project, resulting in a more cohesive and professional-looking final product.

The Curing Stage: Ensuring Proper Hardening

The curing stage is critical when working with resin. It involves allowing the resin to harden and solidify into its final form. Properly curing resin is essential to ensure a durable and long-lasting finished product. Here, we will discuss the different stages of resin curing and the challenges of introducing a new resin batch.

Different Stages of Resin Curing

Resin curing typically occurs in several stages, each with its characteristics and requirements. These stages include:

  • Gel Time: This is the initial stage where the resin thickens and turns into a gel-like consistency. At this point, it is crucial to monitor the resin closely as it transitions from liquid to gel form.
  • Tack-Free Time: Once the resin has reached its gel state, it will harden until it becomes tack-free. Tack-free time refers to the point at which the surface of the resin is no longer sticky or easily marred by touch.
  • Complete Cure: The final stage of resin curing is achieving a full cure, where the resin has completely hardened and reached its maximum strength and durability.

During these stages, potential issues may arise which can compromise the quality of your resin project. By understanding these issues and taking preventive actions, you can ensure proper hardening without compromising quality.

Identifying Common Issues During Curing

When introducing a new batch of resin during the curing process, there are potential challenges that may arise:

  • Incomplete Mixing: If the new resin batch is not thoroughly mixed with the existing one, it can result in an uneven distribution of colourants or additives, leading to hazy or milky areas within the cured piece.
  • Chemical Reactions: When two different resin batches are combined, chemical reactions can occur. These reactions can cause cloudiness or discolouration in the cured resin. Understanding the chemical properties of the used resins can help minimise these reactions.
  • Differences in Curing Times: If the new resin batch has a significantly different curing time compared to the initial batch, it can lead to uneven curing and result in visible seams or inconsistencies in texture. This issue can be overcome by carefully selecting resins with similar curing characteristics.


Measuring and mixing resin correctly is crucial. To ensure successful resin projects, it is essential to approach the process with precision and care. Understanding the different stages of resin curing and being aware of the possible challenges that may arise when introducing new batches can ensure a smoother and more successful curing process. Taking precautions such as thorough mixing, considering chemical properties, and selecting compatible resins will help you achieve consistent results in your resin projects. If you want to learn more about resin arts and crafts, Contact Us on Arts Shala for valuable insights and skills on your creative journey.
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