How to Fix Flexible Resin

Like most people, you probably think of Resin as a hard, glassy material. But what if I told you that there’s another type of resin one that’s flexible? This lesser-known type of Resin can be used for a variety of purposes, from making products to repairing damaged items.

How to Fix Flexible Resin

If you’re interested in learning more about flexible Resin and how to use it, read on! We’ll cover everything you need to know in this post. This blog post will show you how to fix flexible Resin with the most common problems. We will also show you how to prevent these problems from happening in the first place. Keep reading for more information.

Summary: Fixing flexible resin can be a bit of a challenge, but with the right techniques it can be done. First, make sure that the resin is completely dry. If it is still wet, the fix will not work. Second, use a heat gun or hairdryer to warm up the resin until it becomes pliable. Be careful not to overheat the resin or you may damage it.

5 Reasons That Causes Flexible Resin

  1. If the Resin you used is not qualified.
  2. If the viscosity of the Resin is too low, which will make it easy to crack or peel off when cured.
  3. If the Resin’s start point is too high.
  4. If you don’t fully mix Resin and hardener.
  5. If your silicone mold temperature is higher than 40 degrees celsius, this will also cause the flexible Resin to crack or peel off easily once cured.

15 Effective Ways on How to Fix Flexible Resin

Step 1: Gather Necessary Tools and Materials

To fix flexible resin, you will need the following tools and materials:

  • Uncured flexible resin
  • Cured flexible resin (for filling holes or gaps)
  • Isopropyl alcohol or resin cleaner
  • Clean, lint-free cloth
  • Silicone or plastic mold (if creating a new part)
  • Silicone or plastic mixing cup
  • Wooden stir sticks
  • Disposable gloves
  • Safety goggles
  • Respirator or mask (optional, but recommended)
  • UV or LED curing light (if using UV/LED-curable resin)
  • Heat gun or hairdryer (optional)
  • Razor blade or craft knife
  • Sandpaper (various grits)
  • Tweezers (optional)
  • Paint or pigments (if coloring the resin)
  • Clear coat (if sealing the resin)

Step 2: Ensure Safety

Before starting the repair process, wear disposable gloves, safety goggles, and a respirator or mask (if desired) to protect yourself from any fumes or skin irritation caused by the resin.

Step 3: Clean the Damaged Area or Mold

If fixing a damaged flexible resin part, clean the area around the damage with isopropyl alcohol or resin cleaner and a lint-free cloth. This will remove any dirt, grease, or debris and ensure proper adhesion of the new resin.

If creating a new flexible resin part, clean the silicone or plastic mold with isopropyl alcohol or resin cleaner and a lint-free cloth to remove any residue or debris.

Step 4: Prepare the Resin

Pour the appropriate amount of uncured flexible resin into a silicone or plastic mixing cup. If coloring the resin, add paint or pigments according to the manufacturer’s instructions and mix thoroughly with a wooden stir stick. If fixing a damaged part, ensure that the color of the new resin matches the original part as closely as possible.

Step 5: Apply Heat (optional)

If the flexible resin is too thick or difficult to work with, use a heat gun or hairdryer to gently warm the resin, making it more fluid and easier to apply. Be careful not to overheat the resin, as this can cause it to cure prematurely or become too thin.

Step 6: Apply the Resin

For fixing a damaged part, apply the uncured flexible resin to the damaged area using a wooden stir stick, ensuring that the resin fills any holes or gaps completely. If necessary, use tweezers to position small pieces of cured flexible resin in the damaged area to help fill larger holes or gaps before applying the uncured resin.

For creating a new part, pour the uncured flexible resin into the clean silicone or plastic mold, ensuring that the mold is filled completely and evenly.

Step 7: Remove Air Bubbles (optional)

If air bubbles are present in the applied resin, use a heat gun or hairdryer on a low setting to gently warm the surface of the resin, causing the bubbles to rise and pop. Be careful not to overheat the resin, as this can cause it to cure prematurely or become too thin.

Step 8: Cure the Resin

If using UV/LED-curable resin, place the damaged part or filled mold under a UV or LED curing light for the amount of time specified by the resin manufacturer. If using a different type of flexible resin, allow the resin to cure according to the manufacturer’s instructions.

Step 9: Remove the Cured Resin (if creating a new part)

Once the resin has cured completely, carefully remove the new part from the mold by gently flexing the silicone or plastic material until the part releases.

Step 10: Trim and Sand the Resin

Using a razor blade or craft knife, carefully trim any excess resin from the repaired or newly created part, taking care not to cut or damage the surrounding material. Use sandpaper of various grits, starting with a lower grit (e.g., 100-200 grit) and working your way up to a finer grit (e.g., 600-800 grit), to smooth and refine the surface of the resin. Be sure to sand in the direction of the grain, if applicable, to maintain a uniform appearance.

Step 11: Clean the Resin

After sanding, clean the repaired or newly created part with isopropyl alcohol or resin cleaner and a lint-free cloth to remove any dust or debris.

Step 12: Apply Paint or Pigments (if necessary)

If the repaired or newly created part requires additional color or detail, apply paint or pigments according to the manufacturer’s instructions. Allow the paint or pigments to dry completely before proceeding.

Step 13: Apply Clear Coat (if desired)

If desired, apply a clear coat to the repaired or newly created part to protect the surface and provide a glossy, durable finish. Follow the manufacturer’s instructions for application and drying time.

Step 14: Inspect the Repaired or Newly Created Part

Examine the repaired or newly created part to ensure that it is free of defects and that the flexible resin has been applied and cured properly. If any issues are present, repeat the necessary steps to correct them.

Step 15: Reattach the Repaired or Newly Created Part (if applicable)

If the flexible resin part is part of a larger assembly, reattach it to the appropriate location, ensuring that it fits securely and functions properly.

By following these steps, you can successfully fix flexible resin, whether you are repairing a damaged part or creating a new one. With proper care and maintenance, flexible resin parts can provide long-lasting durability and versatility for a wide range of applications.

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Tips To Prevent Bendy Resin

1. Make Sure Your Surface is Clean

Before attempting to paint your Resin, make sure you’ve given it a good clean. Dust and oil sitting on the surface of the Resin will prevent paint from bonding to it properly. If you’re painting an item that has already been cast, try cleaning it with soapy water or isopropyl alcohol before painting; this should remove any oily residue that can stop paint from bonding to the Resin.

2. Thin Your Paints

Excess paint on a model can cause sagging and drooping as it starts to dry, so thinning your paints slightly will help reduce the risk of this happening. You may also want to give the surface of your painted items a quick coat of varnish before painting to reduce further the risk of paint running.

3. Don’t Use Glossy Paints

If you’re painting a large area with glossy paints, they’ll likely start pooling as they dry and cause your surface to sag as a result. Using a matte, satin, or eggshell paints will give you more time to work with the paint and avoid sagging.

4. Paint in a Warmer Area

Painting in a warm room will speed up the drying process of your paints. This means that you’ll have less chance to run into problems with saggy surfaces as your paints dry quickly, and giving you more time to work with them before they start to tighten matte finish paint will help reduce this effect significantly.

5. Keep Your Cool!

During the summer months, warm temperatures can cause surface tension in paints, making them more likely to sag while they dry. If you’re going to be painting a big project during these hotter months, consider moving your work somewhere cooler during the drying process or keeping a fan near you to speed up the process of drying.

Keeping a Fan Near You

6. Fixing Sagging/Drooping Surfaces

Drooping surfaces can occur for a number of reasons; however, it’s often the case that if the paint is wet, they’re almost always fixable! While your paint is wet, lightly pat or roll it back into place using the eraser end of your Exacto knife or a cotton bud. After doing this, the paint should not slip back into its sagging position until it’s dry.

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Difference Between Hard and Soft Resin: Flexible and Rigid Resin

Flexible resins are often mistaken for soft resins because they also come as two parts that must be mixed before use. The difference between the two, however, is crucial. Flexible Resin is a mix of monomer (the clear liquid that carries the polymer particles) and polymer. After the two parts are mixed, the flexible Resin will remain liquid for a few hours before it begins to cure by drying.

When this happens, the flexible Resin will shrink as it dries, so clay pieces sometimes warp once they are dipped in a flexible resin. On the other hand, soft resins only consist of polymer and monomer after mixing. Soft resins become solid as soon as they dry because there is no liquid monomer to evaporate. Because there is no monomer, soft resins do not shrink as they cure. Instead, they only harden and turn solid without changing shape.

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How to Harden Sticky Resin

Sometimes, the Resin can get a little bit of an oily residue on it from handling. When this happens, the oil will prevent the hardener from being able to cure your Resin so you need to clean it off first. I’ve found the best way to wash your molds in water and dish soap.  

The general process for cleaning is to put your Resin in a plastic container, then with the lid on, shake up the soap with warm water, and then dump it into the container with your Resin. Then, shake it up like crazy!

This will wash off most of the oil and dirt that is on your Resin. After rinsing, you can dry it with a paper towel or let it air dry before using it again. If you want to know more, be sure to read this full article on how to fix flexible Resin.

Dry It With a Paper Towel

How to Clean Flexible Resin

Because flexible resins are solvent-based, the residue of uncured Resin can be cleaned up with any paint thinner (such as acetone) or other substances such as methyl ethyl ketone (MEK), butane, or butyl. Also, for a preliminary cleaning, wipe down the surface with isopropanol and let dry.

The surface should then be pre-treated before applying a new coat of flexible Resin to ensure proper adhesion. It is also possible to remove uncured flexible Resin from tools and other surfaces with methylene chloride. Some tools can be cleaned with a rag and acetone, but don’t soak the tool in the acetone as it may break down any glue holding the components together.

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Frequently Asked Questions

What Does It Mean if Your Resin is Flexible?

Resin that is flexible typically refers to a resin that is brittle or has a limited shelf life. This means that it may not be suitable for use in high-stress applications, such as in medical devices or pipelines. In addition, if the resin becomes too flexible, it can become dangerous and difficult to manage.

It’s important to note that there are a variety of factors that can contribute to a resin becoming too soft or flexible, including temperature fluctuations, humidity levels, and atmospheric pollutants like ozone. If you’re noticing this type of behavior with your resins, then it may be time to consult with a specialist who can help determine the cause and recommend appropriate remediation measures.

Can You Fix Resin After Its Cured?

the best approach will depend on the type of resin and the severity of the problem. However, many people find that using a hardener (such as mineral oil) helps to fix resins that have been cured incorrectly.

This process can be done by mixing equal parts hardener and resin together until you get a thick consistency. Apply this mixture to your project with an applicator brush or spritz bottle, and let it dry for several hours before use.

Why Did My Resin Not Get Hard?

There are a few reasons why your resin may not have hardened after being mixed and cured. The most common reason is that the resin was not mixed correctly. If the resin is not properly mixed, it will be difficult to cure and may even form clumps or chunks during curing.

Another common reason for failed hardening is improper curing. If the resin is not cured properly, it will remain soft and may even start to decompose.

If you notice any of these symptoms in your resin, it is best to contact the manufacturer or your local distributor for help diagnosing and resolving the issue.

Which Resin is More Flexible?

While both resin systems are flexible, wood-based resins may be more forgiving when it comes to changes in temperature or moisture. This is due to the natural modifiers that are present in wood-based resins, such as tannin and Published Wood Extracts. These additives help to resist cracking and stiffness while still allowing for a high degree of flexibility.

synthetic resin systems may not be as tolerant of changes, especially if they’re exposed to extreme temperatures or water hardness. This is because these types of resins do not contain any natural modifiers and can become brittle over time.


Resin is a material used in many industries for its strength, flexibility, and corrosion resistance. However, the Resin can also be difficult to work with and requires specific preparation and handling procedures to achieve the best results.

Once you know what needs to be fixed, use a brush or cotton swab to apply a small amount of acetone to the area. If the fix is on a surface that customers will see, wait for the acetone to dry completely. We hope this article helped explain how to fix flexible Resin. If you have any other questions about the process, feel free to comment below!

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