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Why Is My Clear Epoxy Resin Turning Yellow? (And What You Can Do About It)

Gloved hands pour clear epoxy resin — a key material for deep pour epoxy resin projects — from a measuring cup, showcasing its glossy, viscous flow as it cascades onto the surface.
So… you open your clear epoxy resin, ready to make magic.Only to find it looks more like aged chamomile tea than crystal water. Ugh. What happened??! The truth is, epoxy resin yellowing is inevitable — but not unpredictable.All resin yellows eventually, but how soon and how much depends on how you store it, how you apply it, and what materials you use with it. Here’s what might be turning your resin yellow — and what you can do to stop it before it starts.

UV Light: The  1 Resin Killer

Resin and the sun are not friends. UV light breaks down the molecular structure of epoxy, causing yellowing over time.


What helps:


  • Choose resin that contains HALS (Hindered Amine Light Stabilizers) and UV filters
  • Keep artwork out of direct sunlight
  • Store unused resin in a cool, dark space


Heat Exposure

Leaving cured resin art near heat sources can lead to discoloration — and not in a pretty way. Common heat-related dangers include:


Storing art in attics or sheds without climate control


Hanging artwork above heaters or heat vents


Placing art in sunrooms or under gallery lights


What helps:


  • Display your resin pieces in cool, shaded areas
  • Avoid storing resin (cured or uncured) in hot environments


Over-Torching While Removing Bubbles

Torching is great for popping bubbles. But holding the flame too close or staying in one spot too long can damage the resin.


Signs of over-torching:


Yellow patches in isolated spots


Rippled or distorted surface


What helps:


  • Hold your torch a few inches away
  • Keep it moving — like ironing clothes
  • Remember: Less is more when it comes to heat


Using a Sealant That Yellows

Sometimes it’s not the resin — it’s the sealant. Certain spray sealants can yellow over time, ruining your finish.


Best practices:


  • Use non-yellowing sealants (like Krylon Crystal Clear or UV Resistant Spray)
  • Always test on a scrap first
  • Only seal when necessary (e.g., over porous materials or delicate paper)


  1. Painting Over Wet or Tacky Paint
    That acrylic paint you applied might feel dry… but it’s not. Applying resin over paint that hasn’t cured completely can cause clouding or yellowing later on.


What helps:


  • Let paint dry thoroughly — sometimes for days or even weeks
  • If it feels tacky, soft, or cool, it’s not ready
  • Patience = clarity


Titanium White + Resin = Trouble

White paint might be sabotaging your work. Titanium Dioxide (TiO₂), found in titanium white paint, can chemically interact with resin and speed up yellowing.


What helps:


  • Apply a clear barrier sealant between the paint and resin
  • Use non-reactive whites or test alternatives beforehand


Thick Resin Layers (a.k.a. The Yellow Amplifier)

Even a little yellowing looks worse in bulk. Just like water looks blue in an ocean but clear in a glass, resin yellowing becomes exaggerated in thick pours.


What helps:


  • Stick to thin, even coats
  • Avoid excessive layering unless using a deep-pour formula
  • Consider tinting the resin slightly if needed


Can Yellowed Resin Be Fixed?


Short answer: Not really.
But here's what you can try:


Lightly sand and recoat with fresh resin (only if yellowing is on the surface)


Color it intentionally — add pigments or dyes to turn yellow into “warm amber glow”


Use it for practice or darker backgrounds


Dispose responsibly if it’s beyond saving


Final Tips to Keep Resin Crystal Clear


  • Buy smaller resin kits you can finish within 30–60 days
  • Store unopened bottles in a cool, dry, dark place
  • Don’t overtorch
  • Use non-yellowing sealants
  • Let all paints fully dry before pouring
  • Watch out for titanium white or unsealed natural materials
  • Avoid prolonged heat and light exposure
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