Why a Small Quantity of Resin is Getting Thick Very Quickly?

Why a Small Quantity of Resin is Getting Thick Very Quickly?

Jun 14, 2024

Resin art has become extremely popular recently, allowing artists and crafters to make beautiful, unique artwork. However, many resin artists face a common problem: the resin starts to thicken quickly, even when only working with a small amount. Understanding why this happens is crucial for anyone who works with resin because it can greatly impact their projects. Additionally, consider joining a resin art workshop where you can learn everything there is to know about working with resin and find effective solutions for controlling its thickness.

It's important to realise that resin thickening fast isn't just a minor inconvenience; it can significantly affect how your artwork turns out. Whether you're making a tiny piece of jewellery or a huge resin painting, knowing what causes this problem and taking steps to prevent it can make a huge difference. Let's have a closer look at why resin thickens and find ways to prevent it from happening.

Factors Causing Resin to Get Thick Quickly

Resin is a popular material used in various arts and crafts activities due to its versatility and ability to create stunning, glossy finishes. However, one common issue that artists often encounter is the resin getting thick quickly during the mixing process. This can be challenging and can affect the outcome of the project. Let’s explore some of the factors that contribute to resin thickening and how they can be managed.

1. Mixing Ratio

The mixing ratio plays a significant role in determining the viscosity of resin. The resin consists of two components - resin and hardener - that need to be mixed in the correct proportions for optimal results. If the mixing ratio is not followed accurately, it can cause issues such as resin thickening.

When the mixing ratio is incorrect, it disrupts the chemical reaction caused by the resin and hardener. This imbalance affects the curing process and causes the resin to become thicker than desired. For example, adding too much hardener compared to the resin can accelerate the curing process and result in rapid thickening.

To avoid this problem, it is essential to precisely measure and mix the resin and hardener according to the manufacturer's instructions. Using accurate measuring tools like scales or graduated cups can help ensure precise ratios and prevent issues with resin thickness.

2. Excessive Colour Addition

Adding colour to resin is a common practice to create vibrant and unique art pieces. However, using an excessive amount of colour can lead to problems with resin thickness. Certain pigments or dyes used for colouring resin have their viscosity properties. When too much colour is added, it increases the overall viscosity of the mixture, making it thicker. This can make it challenging to work with and may affect its flow and levelling properties.

To maintain proper consistency while adding colour, it is suggested to start with small amounts and gradually increase as needed. Doing so can achieve the desired colour intensity without compromising the resin's viscosity. You can also explore using mica powder as an alternative for colouring resin, as it offers a wide range of vibrant shades without significantly affecting the viscosity.

3. Improper Mixing Technique

Apart from the mixing ratio, the technique used to mix resin can also impact its viscosity. Improper mixing, such as stirring too vigorously or slowly, can thicken resin. When the resin is mixed too vigorously, it introduces air bubbles. These air bubbles can interfere with the curing process and lead to uneven curing or thickening of the resin. On the other hand, stirring too slowly may not adequately blend the resin and hardener, leading to an incomplete reaction and subsequent thickening.

To ensure proper mixing, it is advisable to stir gently and evenly, avoiding excessive agitation or prolonged stirring. This will help minimise the introduction of air bubbles and promote a thorough blending of the components.

4. Inadequate Surface Preparation

Another factor that can cause the resin to thicken quickly is improper surface preparation before applying the resin coating. If the surface is not clean or there are any contaminants present, they can react with the resin and affect its consistency.

It is important to completely clean and prepare the surface before applying the resin to prevent this issue. This involves removing any dirt, dust, grease, or other contaminants that could interfere with the resin's ability to adhere properly.

Additionally, ensuring that the surface is dry and moisture-free is crucial, as water can also react with the resin and cause it to thicken prematurely. Taking the time to properly prepare the surface will help maintain the desired viscosity of the resin and ensure a more successful and durable coating application.

Preventive Measures to Keep Resin Consistency in Check

When it comes to resin art, preventing the thickening of resin, even in small quantities, is crucial for achieving the desired results. By implementing a few preventive measures during the resin mixing process, you can maintain the optimal consistency of your resin. Let's explore some effective ways to keep resin consistency in check:

1. Ensure Proper Ventilation

Proper ventilation is essential during the resin mixing process to prevent the quick thickening of resin. When working with resin, it undergoes a chemical reaction called polymerisation, which generates heat. Inadequate airflow can trap this heat and accelerate the thickening process. To ensure proper ventilation:

  • Work in a well-ventilated area: Choose a room with good air circulation or set up fans to improve airflow.
  • Use a respirator: Wear a respirator mask designed for working with epoxy resin to protect yourself from inhaling harmful fumes.
  • Open windows or use exhaust fans: Create an avenue for fresh air to enter and fumes to exit the workspace.

By maintaining proper ventilation, you can slow down the thickening process and have more control over your resin art projects.

2. Other Preventive Measures

In addition to proper ventilation, you can take other preventive measures to manage resin thickness effectively. These measures include:

  • Safe disposal methods for overheated resin: If your resin starts to thicken due to excessive heat generated during the mixing process, it is crucial to dispose of it properly. Avoid pouring it into the sink, as it can clog drains. Instead, allow it to solidify and dispose of it according to local regulations.
  • Exploring deep pour epoxy for deep moulds: Deep moulds often pose challenges when it comes to preventing the rapid thickening of resin. Deep-pour epoxy, specifically formulated for such applications, can help maintain a consistent viscosity throughout the curing process.
  • Maintaining a cool working environment: Heat accelerates the chemical reaction in resin, leading to faster thickening. Keep your workspace cool by using air conditioning or fans. Avoid working in direct sunlight or near heat sources that can cause temperature fluctuations.

These preventive measures ensure a smoother resin art experience with consistent resin viscosity and ample working time.


Managing resin thickness can be challenging, whether working with a small or large quantity. The viscosity of resin plays a crucial role in achieving the desired results in resin art projects. In this blog, we have explored various factors that can cause the resin to get thick quickly and discussed preventive measures to keep resin consistency in check.

Understanding the importance of the mixing ratio is essential when working with resin. The right balance between resin and hardener ensures proper curing and prevents the resin from becoming too thick too quickly. Additionally, excessive colour addition can negatively impact the viscosity of the resin, leading to unwanted thickness. To further enhance your knowledge and skills in resin arts and crafts, Contact Us on Arts Shala for comprehensive guidance on various aspects of resin art, including managing resin thickness.
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