Stickiness Be Gone: How to Harden Sticky Resin Like a Pro!

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Resin is known as a versatile material that woodworkers use for various projects, from beautiful furniture and decorative pieces to jewelry and artwork. However, working with resin can be challenging, especially when encountering sticky, tacky, or runny resin issues. 

In this article, I’ll take you through some of the common snags you might hit when curing resin, drawing from my own experiences to offer practical solutions that I’ve found to work. It’s all about getting to grips with these issues so that you, too, can produce professional-grade results.

How to Harden Sticky Resin?

Sticky resin can be frustrating and detrimental to the outcome of your project. It is crucial to address the stickiness promptly to prevent further complications. Here are some measures to harden sticky resin effectively:

scraping sticky resin

Add another layer of resin for sticky spots after curing

If you notice sticky spots on the cured resin, a quick fix is to apply another layer of adequately measured and mixed resin over the affected areas. This method allows the new layer to bond with the existing resin and cover the stickiness.

Measures for runny or tacky resin

I’ve learned through experience that runny or tacky resin is often the result of a few common missteps: not getting the measurements just right, working in less-than-ideal room temperatures, or not mixing the components thoroughly. I’ll share a closer look at each of these factors in the following sections, so you can understand just how crucial they are to the resin-curing process—and how to get them right.

Consequences of leaving sticky resin without fixing

Ignoring sticky resin and leaving it unattended can lead to further softening and damage to your project over time. Additionally, it may affect the adhesion of paints, coatings, or other finishes you apply over the resin surface.

Tacky Resin

Tacky resin is a common problem caused by improper curing. It can be attributed to various factors, including incorrect measurements, room temperature, and inadequate mixing.


Possible Reasons for Tacky Resin

How to Fix Tacky Resin

To fix tacky resin, follow these steps:

pouring tacky resin

Additional Options for Fixing tacky resin

Comparison of Tacky Resin Fixes

Fixing Method


Ease of Application


Adding another layer of resin




Moving to a warmer place




Applying Modge Podge




Using Triple Thick Polyurethane




Runny Resin

Dealing with runny resin can really test your patience, believe me. It messes with the precision of your work and can cloud the clarity we all strive for in a finished resin piece. I’ve come to understand the importance of getting to the root of why resin turns runny—it’s the only way to tackle the problem effectively. Let me walk you through what I’ve learned and how to fix it.

runny resin

Reasons for Runny Resin

How to Fix Runny Resin

To fix runny resin, follow these steps:

preparing epoxy resin

Comparison of Runny Resin Fixes

Fixing Method


Ease of Application


Scraping off the runny resin




Applying a new layer of resin




Soft Spots

I’ve noticed that soft spots in cured resin often trace back to a couple of things: either I didn’t mix the components properly or I neglected to scrape the sides and bottom of the container while pouring. Getting this right is key to a uniform finish, and I’ll share how I’ve learned to avoid these pitfalls.

Cause of Soft Spots

Improper mixing without scraping the container: Inadequate mixing can lead to uncured or partially cured spots in the resin, resulting in soft areas.

mixing resin

How to Fix Soft Spots

To fix soft spots in cured resin, follow these steps:

Comparison of Soft Spots Fixes

Fixing Method


Ease of Application


Sanding down the resin




Applying a new layer




Tips and Tricks for Working with Resin

When I’m working with resin, I know it’s all about precision and keeping a keen eye on the details. Over the years, I’ve picked up a few handy tips and tricks that have been invaluable for my resin projects. Let me share some of these with you to help ensure your resin work is just as successful.

filling container with Upstart Epoxy Deep Pour Epoxy Resin Kit DIY

Use Modge Podge to fix sticky or tacky spots

As mentioned, Modge Podge can help harden the tacky resin and fix sticky spots, providing a smoother finish.

Applying Triple Thick Polyurethane for tacky casts

Triple Thick Polyurethane is an excellent alternative to resolve tacky resin issues. It can be applied as a protective topcoat to harden sticky areas.

Applying resin to the entire surface to avoid seam lines

Use the resin across the whole surface to avoid seam lines or visible edges in your resin project. It will create a seamless and professional look.

Importance of thorough mixing and not scraping while pouring

Always mix the resin and hardener thoroughly, following the manufacturer’s instructions. Avoid scratching the sides and bottom of the container while running to prevent contamination and ensure proper curing.

Working in a warm space with a proper temperature

Maintain a warm and well-ventilated workspace for resin projects to promote proper curing and reduce the chances of tackiness or runniness.

pouring epoxy resin

Correctly measuring colorant and maintaining a 1:1 ratio

Precise measurement of colorants is essential to achieve the desired color in the resin without affecting the curing process. Always keep the proper 1:1 ratio of resin and hardener.

Practice round before tackling larger projects

If you’re new to working with resin, consider doing a practice round on a small project before embarking on more significant and intricate pieces.

Following package instructions carefully

Always follow the instructions provided by the resin manufacturer, including curing times, temperature requirements, and safety precautions.

How to Ensure Proper Resin Curing

Setting up the right working conditions is crucial for getting that perfect resin cure. I’ve learned to take specific precautions to ensure the environment is just right, which makes all the difference in the outcomes of my resin projects. Let me show you how to set up your space to achieve those excellent curing results we’re all after.

Maintaining a well-ventilated workspace

Proper ventilation is essential to prevent the buildup of harmful fumes during the resin curing process. Work in a well-ventilated area or consider using a respirator.

preparing work area

Wearing appropriate protective gear

Wear safety goggles, gloves, and a respirator to protect yourself from hazards when working with resin.

Cleaning mixing containers to prevent contamination

Before mixing a new batch of resin, ensure the mixing container is thoroughly cleaned to avoid contamination that might affect the curing process.

Using proper mixing cups with measurement indicators

Invest in mixing cups with clear measurement indicators to ensure accurate measurements of resin and hardener.

Checking resin limits and curing conditions specified by the manufacturer

Every brand of resin has specific limitations and curing conditions. Always follow the manufacturer’s recommendations to achieve the best results.


How long should epoxy be tacky?

The tackiness of epoxy can vary depending on various factors, including the brand of resin and the curing conditions. Epoxy [1] should remain tacky for up to 24 hours after the recommended curing time. If it remains tacky beyond this period, it indicates an issue that needs to be addressed.

Why is resin not hardening?

The resin may not harden properly due to incorrect measurements, inaccurate mixing, low curing temperatures, expired resin or hardener, or inadequate mixing. Addressing these issues can help achieve proper resin curing.

How to resolve sticky resin issues?

Sticky resin can be resolved by adding another adequately measured and mixed resin layer, moving the project to a warmer place, or applying Modge Podge or Triple Thick Polyurethane as a topcoat.

What are the causes of runny resin?

Runny resin can result from incorrect measurements, excessive hardener, or imprecise colorant addition. To fix runny resin, scrape off the excess resin and apply a new layer with proper measures.

Why do soft spots occur, and how to fix them?

Soft spots occur due to improper mixing without scraping the container’s sides and bottom. To fix soft spots, sand down the cured resin, remove uncured areas, and apply a new layer of properly mixed resin.


Resin work can yield stunning and impressive results when done correctly. Understanding the potential issues of sticky, tacky, and runny resin, and knowing how to fix them, is essential to ensuring successful resin projects. 

By following the tips and tricks provided and taking proper precautions for resin curing, you can elevate your woodworking skills and create beautiful resin masterpieces that will stand the test of time. Happy crafting!

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Robert Johnson is a passionate furniture maker & carpenter, sought after for his knowledge on the craft.
You’ve probably seen his down-to-earth wisdom in USA Today, Bobvila, Family Handyman, and The Spruce, where he has shared commentary and guidance on various woodworking topics.

Robert is the brain behind Sawinery, where he aims to share tips, tricks, and a passion for all things carpentry.

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