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Why Is UV Resin Sticky & Tacky After Curing?

Why Is UV Resin Sticky & Tacky After Curing? | 3D Printing Spot

Updated by

William Stone


January 12, 2023

Have you seen UV resin become sticky and tacky after curing? We are going to give you comprehensive answers on why this happens.

Why does UV resin become sticky and tacky? Which are the reasons for this? Which are the most effective solutions to solving this problem?

UV resin stickiness and tackiness result from dirty and wet UV resin, UV lamps without the right strength and wavelength capacity, oxygen inhibition, and inadequate curing time. These factors inhibit the effective curing of UV resin, therefore causing stickiness and tackiness.

This article will be a comprehensive guide on why UV resin becomes sticky and tacky after curing. It will examine the potential reasons that will help you know why it becomes sticky and tacky after using it. In addition, it will propose effective solutions on how you can prevent this problem.

Our objective is to offer you highly reliable and up-to-date information on various topics that need an informed investigation. In order to achieve this, we boast of a competent team of professionals who are well versed in the various topics of discussion. The professionals have accumulated vast experience in their respective fields having worked in such fields for many years. Therefore, when you seek answers from us, be sure that you will get authoritative and high quality information.

Table of Contents


What causes UV resin to be sticky and tacky after curing? Normally, UV resin hardens after curing successfully. However, there are times when the curing process fails, and this leads to UV being sticky and tacky. There are several reasons that cause this to happen. In this article, you’ll get to understand why UV resin fails to harden and, instead, becomes sticky and tacky.

Potential Reasons Why UV Resin is Sticky and Tacky

There are various reasons that cause UV resin to be sticky and tacky. Here is a detailed discussion of the factors that cause stickiness in UV resin:

Unclean and Wet UV Resin

Before the curing process, it is important for UV resin to be clean and dry. Just like it is for other processes, if the surfaces and elements being used are not clean enough, there will obviously be problems. Washing it thoroughly and allowing it to dry well before the curing process is a standard practice you should follow. If you fail to do so, there will be problems. If you attempt to cure UV resin when it’s dirty, it will lead it to be sticky and the quality you need won’t be there.

Weak UV Lamp

You need a strong UV lamp for the curing process of UV resin to be successful. Normally, the ability of UV resin to cure faster depends on the UV lamp’s intensity. So, if you use a UV lamp that is too weak, it will definitely affect the curing process and your UV resin will be sticky.

Oxygen Inhibition

If UV resin gets exposed to oxygen this affects the efficiency of the UV light used in during the curing process. Whenever this happens, the consequence is that your UV resin takes too much time to cure. Something else that often happens when UV resin gets exposed to oxygen is that the UV light fails to penetrate to all the required areas of the model. This results to a tacky UV resin.

Longer Curing Time

If it’s taking too long for UV resin to cure, it will definitely cause it to be sticky and tacky. The capacity of UV lamp plays a major role in how fast or slow the curing process happens. It’s important to take note that this process isn’t instant. So, if sufficient time is not there for your UV resin to cure well, you’ll notice it being waxy and sticky.

Solutions to the Problem of UV Resin being Sticky

The following are possible solutions you can undertake to prevent cases of sticky UV resin after curing:

Ensuring that UV resin is clean and dry

This is a simple exercise that can solve this frustrating problem. A clean UV resin won’t have any problems with curing as long as other factors are okay as well. To ensure that it is clean, it is advisable that you place it in a container with isopropyl alcohol for around 30 seconds. Make sure that you seal the container. Repeat the process in another container containing clean isopropyl alcohol. This will help to keep the UV resin clean and give it the right environment to have a successful curing process.

Ensure that you use a UV Lamp with Adequate Power

It’s important to use the correct UV lamp in terms of power and wavelength. If you’re going to purchase a UV lamp, it’s highly advisable you go for the one with not less than 30 watts. Make sure it has a wavelength that matches what the UV resin you’re using needs. This will make sure that you don’t incur challenges that will affect the functional ability of the UV lamp. Ultimately, this will go a long way to prevent your UV resin from exhibiting stickiness. The bottom-line is that by using a UV lamp containing stronger watts, it will be possible to have a successful curing process.

Allow Your UV Resin to Have Sufficient Time for Curing

Part of what makes your UV resin not to be as hard as you would need it to be is not giving it adequate time to cure. Well, there are factors that determine how much time your UV resin takes to cure including your model’s size and the intensity of the UV lamp you use. Essentially, for UV resin to cure, it can take from around 5 minutes to 30 minutes. So, if there is sufficient time for UV resin to cure, there won’t be cases of stickiness. It is also recommended that you place resin in the sun for it to dry further. You can allow it to rest in the sun for about 3 days for you to achieve expected results. The bottom-line is that adequate time carries a great deal of significance for any process to be successful. This is the same for the curing process of UV resin. Depending on the factors discussed above, you may need to be more patient for the curing process to be effective.

Take a Keen Interest on Moisture

You should be careful with the moisture on your resin because it contributes to how it cures and the quality of the end result. The chances of resin being sticky increases when it is not fully dry. So, ensure that it is dry. If it’s dry, it won’t have problems with being sticky.

Wrapping Up

Stickiness of UV resin is a major issue after the curing process. It is a common problem you may face. However, it is something you can prevent with ease if you can put into consideration the factors that affect the curing process. Paying much attention to the required factors goes a long way to preventing the issue from occurring in the first place. Make sure that UV resin is clean and dry, use a UV lamp with the right strength and wavelength, allow the UV resin to have adequate time to cure, and prevent oxygen inhibition to prevent UV resin stickiness.


William Stone

William Stone

William has spent 20 plus years in the custom manufacturing industry as a COO, CEO and Owner of various custom product businesses. His experience has exposed him to all types of manufacturing from die cast, die struck, injection molding, CNC machining, laser etching, engraving and of course 3D printing.

Learn more about William Stone

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Why Is UV Resin Sticky & Tacky After Curing?

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