Resin Cure Times guide: How Long To Dry [2025]
We are going to answer one of the most asked questions: How long does it take for resin to dry and cure? This resin curing guide is here to help!
Resin, known for its ability to transform everyday objects into stunning works of art, is a popular crafting medium. And today we will discuss your common questions about how long does it take for resin to dry.
And if you’ve ever used resin, you know that “drying” and “curing” are not quite the same thing.
Understanding about working with resin with help give you the best results with your resin projects. We will go through all of this together so you have a better understanding on resin curing times.
From quick-setting UV resins to curing periods for epoxy resin types, we’ll share the factors that influence these timelines and offer insights to help you become a resin pro.
How Long it takes for resin to cure
1. Epoxy Resin Cure Times
So how long does it normally take for epoxy to cure? The most common curing time for epoxy resin is typically around 24 to 72 hours. This duration may vary slightly depending on the specific brand and formulation of epoxy resin you’re using.
It’s important to note that epoxy resin curing times can be influenced by factors such as temperature, humidity, and the thickness of the resin layer.
In some cases, epoxy resins designed for faster curing may set in as little as 12 hours, while others, formulated for deep pours or specific applications, might require several days to achieve full curing and hardness.
Always refer to the manufacturer’s instructions for the epoxy resin product you’re using to ensure the most accurate curing time.
2. UV Resin Cure Time
How to make UV resin hard will take a UV lamp for resin curing or sunlight. The cure time for UV resin is typically much faster than for traditional epoxy resins, UV resin cures almost instantly or within a few minutes when exposed to ultraviolet (UV) light.
The exact curing time can vary depending on things such as the intensity of the UV light source, the thickness of the resin layer, and the specific brand and formulation of UV resin.
In many cases, UV resin can cure within 1 to 5 minutes when exposed to a UV lamp or direct sunlight. Some UV resins are designed to cure quickly to facilitate rapid production in applications like jewelry making, fly tying, or small craft projects.
For more different types of resins, see our guide on the types of resin that are available and what they can be used for.
Its rapid curing time, often within minutes, makes it a popular choice for various applications, including jewelry making, 3D printing, and model building.
UV resin is celebrated for its clarity, hardness, and the ability to capture fine details, making it ideal for intricate and delicate projects like jewelry.
I made this pendant and it cured in under 3 minutes.
Equally as important is to make sure your UV resin lamp is strong enough to cure the resin. If this is something you might want to try to make, head on over to our article about the best UV resins for jewelry making.
It’s important to follow the manufacturer’s recommendations and guidelines for curing times, as they can vary among different UV resin products.
Additionally, take appropriate safety precautions when working with UV light sources to protect your eyes and skin from UV radiation.
3. Polyester Resin Cure Time
This type of resin is different from UV resin in that Polyester resin typically takes 24 to 48 hours to cure. Though full curing may take a few days, depending on environmental conditions and resin thickness.
Manufacturers commonly use these types of resins in fiberglass-reinforced products, including boat building, automotive body repair, and surfboard construction.
Polyester resins are easy to work with and have a relatively low cost. They cure through a process called polymerization. This requires the addition of a catalyst, typically a peroxide, to initiate the curing process.
Polyester resins are strong and resistant to moisture, but they yellow more quickly over time compared to epoxy resins. See why is my resin turning yellow.
4. Polyurethane Resin Cure Time
The cure time for polyurethane resin can vary. It often ranges from 12 to 48 hours for a complete cure. With additional curing time sometimes required for larger or more complex projects.
Polyurethane resins are a diverse group of resins known for their flexibility, impact resistance, and wide range of applications. They are often used in casting and molding for items like figurines, prototypes, and decorative elements.
Polyurethane resins come in a variety of formulations, including flexible and rigid types, which makes them suitable for different purposes. They can be poured, brushed, or sprayed, offering flexibility in application methods.
Polyurethane resins are appreciated for their ability to capture fine details and for their resistance to abrasion. Additionally, they can be tinted or pigmented for various artistic and industrial applications.
Factors Affecting Resin Cure Times:
Here is what to know about curing resin and what can affect the curing times.
Temperature
Temperature is one of the most influential environmental factors when working with resin.
In general, a higher temperature accelerates the curing process, while a lower temperature slows it down. Most resin products have an ideal temperature range for curing, typically between 70°F to 80°F (21°C to 27°C).
Maintain a stable and controlled environment within this range to ensure consistent curing. Extreme temperatures can lead to issues like incomplete curing or crystallization of the resin.
Humidity
Humidity levels can also affect the curing of resin, especially for moisture-sensitive resins like epoxy. High humidity can introduce moisture into the resin, causing cloudiness, bubbles, or a weakened bond.
In contrast, low humidity may lead to faster curing but can result in a brittle or uneven finish. Properly sealing and storing your resin materials in a dry environment is essential to prevent moisture-related issues.
Ventilation
Good ventilation is vital during the resin curing process. Adequate airflow helps disperse any fumes emitted during curing and minimizes the risk of inhaling potentially harmful vapors.
It also assists in reducing the formation of surface imperfections, like dust or particles settling on the resin while it’s still tacky. Use fans or work in well-ventilated areas to ensure a safe and smooth curing process.
Resin Thickness May Alter Cure Times
The thickness of the resin layer will affect the curing and drying time, as well as the overall success of your resin project. Here’s an elaboration on how resin thickness impacts the process:
epoxy resin drying time for Thicker Resin
The thicker the resin layer, the longer it typically takes to cure. This is because curing is an exothermic process (releasing heat), and thicker layers generate more heat, which can extend the curing time.
Depending on the type of resin and its specific formulation, a thick pour may take considerably longer to harden than a thin one.
For large or deep pours, you may need to use resins designed for such applications, as they have longer curing times to prevent excessive heat buildup and ensure complete curing.
Heat Generation
As mentioned earlier, thicker resin layers generate more heat during curing. Excessive heat can lead to issues like bubbling, cracking, or uneven curing. To mitigate this, consider using resins with extended curing times for deep pours.
Additionally, using a heat gun or torch to carefully remove surface bubbles can help maintain the integrity of thick resin layers.
See our guide about why resin gets hot while curing.
Potential for Imperfections
Thicker resin layers are more prone to trapping air bubbles in resin, which can negatively impact the final appearance of your project.
When working with thicker layers, it’s essential to use appropriate techniques, such as a slower pour or applying resin in multiple layers, to minimize the risk of imperfections.
Additives and Accelerators
Additives and accelerators are valuable tools in the world of resin crafting, allowing for customization and control over the curing and drying process.
Keep in mind that using additives in resin can effect cure times and if added to the improper ratio of additives to resin, may cause resin to seize.
Colorants
Color additives, such as pigments, dyes, or mica powders, are commonly used to tint resin and create vibrant, customized designs.
These additives offer endless possibilities for artistic expression, enabling you to craft everything from transparent jewel-toned creations to opaque, multicolored masterpieces. Typically there is no alter to cure times when you are using colorants in resin.
Here I am using Rolio pigment paste and there was no extra curing needed.
Glitters and Inclusions
For that extra touch of sparkle or texture, you can incorporate glitters, sequins, dried flowers, or other inclusions into your resin projects.
These additives add a touch of whimsy and uniqueness to your creations, making them truly one-of-a-kind.
As with colorants, typically there is no alter to cure time using glitters.
Matting Agents
If you want to reduce the glossiness of your resin finish, matting agents can be added to create a matte or satin appearance.
This is useful for specific artistic or decorative effects, such as creating realistic water ripples or diffusing light in resin-based photography. Matting agents can effect cure times so do check the manufacturers directions.
Accelerators
UV-curable resins can be expedited with the use of UV lamps or curing boxes. UV accelerators use ultraviolet light to initiate and speed up the curing process.
This makes them incredibly handy for projects that require rapid results, such as resin jewelry making.
In colder or high-humidity environments, heat accelerators like heat lamps or heat guns can be used to increase the curing speed of certain resins.
This ensures more efficient curing and reduces the risk of imperfections.
Some resins come with dedicated accelerators designed to enhance their curing speed. These accelerators are formulated to work seamlessly with the specific resin brand.
This can be particularly useful in professional or industrial applications where precision timing is critical.
By experimenting with these accelerators, you can fine-tune the curing and drying process to suit your artistic vision and project requirements.
13. Mixing Ratio
The mixing ratio is a fundamental aspect of working with many types of resin, particularly two-component resins like epoxy resin.
It refers to the precise proportions in which you should combine the resin and its corresponding hardener or curing agent.
Always follow the manufacturers mixing ratio. Do not assume that all resins are the same. Each will have their own specific formulas and instructions.
14. Chemical Reaction
Two-component resins require accurate mixing because they rely on a chemical reaction between the resin and hardener to cure. The mixing ratio is determined by the manufacturer. It is typically expressed as a weight or volume ratio, such as 1:1, 2:1, or 3:1.
This ratio is critical for making sure that the components react in the right proportions to get a complete cure.
15. Consistency and Strength
Properly following the recommended mixing ratio is essential for achieving the desired consistency and strength of the cured resin. An incorrect ratio, whether it’s an excess of resin or hardener, can lead to issues like incomplete curing, tackiness, or brittleness in the final product.
16. Inaccurate Mixing
Inaccurate mixing can result in various problems, such as soft spots, bubbles, or an uneven finish.
Use a precise measuring method, such as a digital scale, to make sure the correct proportions of resin and hardener are combined.
17. Working Time
The mixing ratio can also influence your working time with the resin. Some resins may have a limited pot life, which is the time during which the mixture remains workable.
18. Exothermic Reaction
When the resin and hardener are mixed correctly, they initiate an exothermic reaction, releasing heat. This heat can affect the curing time, and in larger or deep pours. Consider the heat generated to prevent issues like warping or cracking.
19. Mold Type
The size and depth of the mold are crucial when working with resin. Ensure your mold’s dimensions match the requirements of your project. Deeper molds may require additional curing time to ensure complete solidification.
The choice of mold type is one of the fun things for resin making. Select the mold that best suits your project’s objectives and your level of expertise to achieve your desired results.
In Conclusion: We hope this information has been insightful and helpful for your creative journey.
If you are having problems with resin staying sticky, go to this article about why resin is not curing for some expert tips and solutions.
Resin crafting offers endless possibilities for artistic expression and craftsmanship, and we encourage you to experiment, learn, and continue to craft beautiful resin creations.
When working with thicker resin pours, it’s important to be patient and take safety precautions. Use proper ventilation, and follow the manufacturer’s guidelines for handling large volumes of resin to avoid health risks associated with exposure to fumes.
