Bare Spots In My Cured Resin

Why Are There Bare Spots In My Cured Resin?

May 13, 2024

Bare spots in cured resin can be a frustrating issue for resin artists. These spots are areas where the resin did not correctly settle or cure, resulting in an uneven and imperfect finish. Understanding the causes of bare spots is essential for preventing them in future projects.

To begin with, it is essential to ensure the proper resin-to-hardener ratio and thorough mixing. An incorrect ratio can hinder the curing process, leading to bare spots. Inefficient mixing can also result in an uneven distribution of components, causing some areas to be cured correctly while others remain uncured.

Consider joining a resin art workshop to gain insights into working with resin without any issues and get valuable knowledge and techniques for achieving flawless finishes in your resin artwork. By understanding the causes of bare spots and learning how to eliminate them, you can achieve stunning resin artwork that is free from imperfections.

Common Causes of Bare Spots in Cured Resin

When it comes to resin artwork, bare spots can be frustrating. These are areas where the resin did not cure properly, leaving behind soft, sticky spots that ruin the overall appearance of your art. To avoid these unsightly blemishes, it is crucial to understand the basic factors that lead to bare spots in cured resin.

Incorrect Resin-to-Hardener Ratio

One of the leading causes of bare spots in cured resin is an incorrect resin-to-hardener ratio. Resin and hardener need to be mixed in the correct proportions for the curing process to take place effectively. If the ratio is off, the resin may not cure properly, resulting in soft spots. It is crucial to precisely measure and mix the resin and hardener according to the given procedures and instructions.

Inadequate Mixing

Another factor that leads to bare spots in cured resin is inadequate mixing. When you combine resin and hardener, it is essential to mix them to ensure the proper distribution of the components thoroughly. If the mixture is not adequately mixed, some areas may have an excess of resin or hardener, while others may have a lack of other components. This uneven distribution can cause uneven curing and result in bare spots.

To prevent bare spots caused by an incorrect resin-to-hardener ratio or inadequate mixing, make sure you measure accurately and mix thoroughly. Take your time when mixing the components, ensuring all parts are well incorporated before pouring.

Identifying and Addressing Bare Spots in Your Resin Artwork

When it comes to identifying and addressing bare spots in your resin artwork, it's essential to have a keen eye for detail and a systematic approach. Here are some guidelines to help you detect and address bare spots:

Visual Inspection

  • Examine the cured resin piece under bright, natural light.
  • Look for areas that appear dull, uneven, or lack the glossy finish characteristic of properly cured resin.
  • Inspect the entire surface to identify any differences in texture or clarity.

Tactile Examination

  • Gently run your fingertips over the surface of the cured resin.
  • Note any rough or uneven areas that may indicate bare spots.
  • Pay attention to temperature variations as you touch different parts of the resin, as improperly cured areas may feel slightly tacky or softer than the rest of the surface.

Once you've identified bare spots in your cured resin artwork, addressing them effectively involves specific techniques such as sanding the affected areas and applying fresh resin for repair. By following these methods, you can ensure that your resin artworks maintain a consistent and flawless finish.

Fixing Techniques for Bare Spots in Cured Resin Art

Proper surface preparation is essential before addressing bare spots in cured resin artwork. By following these fixing techniques, you can restore the flawless appearance of your resin piece:

Sanding the Bare Spots

Start by sanding the bare spots on the cured resin. Use fine-grit sandpaper (around 400-600 grit) to sand the affected area gently. This helps create a rough surface that allows the fresh resin to bond correctly. When sanding, wearing a mask and working in a well-ventilated area is necessary to avoid breathing any harmful dust particles.

Applying Fresh Resin

After sanding, clean the sanded area thoroughly to remove any dust or residue. Once cleaned, mix a fresh batch of resin. Apply the fresh resin to the sanded area using a brush or pouring method, ensuring even coverage. To prevent future bare spots, consider slightly overlapping the fresh resin onto the surrounding cured resin during application.

Levelling and Blending

To achieve a seamless finish, use a heat gun or blow torch to eliminate any air bubbles that may have formed after the application of fresh resin. Additionally, gently tilt and rotate your artwork to help level and blend the newly applied resin with the existing cured resin. Be cautious when using heat tools, as excessive heat can cause yellowing or other undesirable effects on the resin.

Choosing the Right Resin for Your Projects

When doing resin art, selecting the appropriate resin is crucial for achieving the desired results. Different applications require different types of resin, and understanding the specific needs of your artwork will help you make the right choice.

Consider Environmental Factors

One of the critical factors to keep in mind when choosing a resin is the environment in which your artwork will be placed. Here are two crucial environmental factors to keep in mind:

  • Temperature: If your project is exposed to high temperatures, such as near a window or in a hot room, selecting a heat-resistant resin is essential. This will prevent your artwork from bending or melting under heat.
  • UV Exposure: Using a UV-resistant resin is essential for artwork that will be exhibited in direct sunlight, like outdoor sculptures or jewellery. This type of resin has chemicals that protect against yellowing and fading caused by UV rays.

Understand Resin Characteristics

In addition to environmental factors, it's also helpful to know about the different characteristics of resins. Here are three important ones:

  • Viscosity: This means how thick or thin the resin is. A low-viscosity resin flows easily and is excellent for creating smooth surfaces or filling moulds with intricate details. On the other hand, a high-viscosity resin is thicker and better for building layers or creating texture.
  • Cure Time: The cure time is how long it takes for the resin to dry and cure completely. Some resins cure quickly within a few hours, while others may take several days. Consider your project timeline and patience level when deciding on a cure time.
  • Transparency: Resins can range from crystal clear to slightly opaque. If you want your colours to pop or need a transparent effect, opt for a clear resin. However, if you're going for an opaque or coloured look, a slightly tinted resin can work well.


Resin art and craft is a journey filled with learning and creativity. Enjoy the process, develop your techniques, and let your imagination flow freely in the captivating field of resin arts and crafts. The key to flawless resin artwork lies in maintaining the correct resin-to-hardener ratio and ensuring thorough mixing. It's essential to apply the proper knowledge and insights to identify, fix, and prevent bare spots in future resin projects. By understanding the causes of the problems and their solutions, you can elevate the quality of your resin artwork. For those eager to learn more deeply about different types of resin arts and crafts, Contact Us on Arts Shala today to expand your skills and knowledge.
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