Why Resin Turns Yellow – And How to Slow It Down with Mycast Epoxy Resin

Introduction

You've just finished a stunning resin piece—clear, glossy, and perfect. But weeks or months later, you notice a yellow tint creeping in.

Why does resin turn yellow?
Can you prevent it?
And does every brand yellow the same way?

In this blog, we break down the causes of yellowing in epoxy resin and explain how Mycast Epoxy Resin is specifically formulated to resist discolouration, so your art stays bright and clear for longer.

What Causes Resin to Turn Yellow?

1. UV Exposure
   The #1 culprit. Ultraviolet (UV) light breaks down the molecular bonds in resin, especially when placed near windows or outdoors.
   
   

2. Heat Exposure
   High temperatures can accelerate the aging process of resin, leading to discolouration—even indoors.
   
   

3. Poor Resin Formulation
   Low-grade resins often lack UV stabilizers or anti-yellowing additives, making them more prone to yellowing even without sunlight.
   
   

4. Contaminated Tools or Pigments
    Using dirty mixing cups, old pigments, or leftover resin can introduce impurities that speed up yellowing.
   

 

How Mycast Resin Helps You Prevent Yellowing

1. Advanced UV Stabilizers
Mycast is formulated with anti-yellowing agents that significantly delay color change even when exposed to light. It’s ideal for long-lasting clarity.

2. Low Heat Reaction
Unlike some resins that exotherm rapidly, Mycast cures at a controlled temperature, reducing thermal stress and long-term degradation.

3. Clean, High-Purity Formulation
Free from fillers and VOCs, Mycast is a clean-pour resin, minimizing yellowing caused by chemical instability or contamination.

4. High Gloss = Light Reflection
The glossy finish not only looks better—it also helps reflect UV rays instead of absorbing them, offering passive protection.

Pro Tips to Minimize Yellowing in Any Resin

• Store finished pieces away from direct sunlight
  

• Add a clear topcoat with UV protection (like a doming layer)
  

• Use non-water-based pigments that won’t accelerate yellowing
  

• Store your resin bottles in a cool, dark place—resin ages even in the container

Final Takeaway

All epoxy resins will yellow over time—but the right formulation can delay the process significantly. Mycast Epoxy Resin is designed for Indian conditions, built with anti-yellowing chemistry, and trusted by resin artists who want their work to stand the test of time.

Make your next resin project last longer—choose Mycast for crystal-clear results.