Does UV Light Cause Resin to Yellow?

Q: How to Prevent Resin Yellowing

Choose UV-Resistant Resin: Look for resins specifically formulated with strong UV filters. Products such as “Icrystal” Epoxy Resin include UV protection designed to slow the yellowing process for up to 10 years under normal use. Minimise Sun Exposure: Whenever possible, display or store your resin pieces away from direct sunlight. Even UV-resistant products can degrade if exposed constantly. Consider Application Thickness: Deeper cast projects often benefit from resins tailored for thicker pours, like “Epoxytable 10-Ten”, which incorporates enhanced UV resistance for large surfaces.

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One of the most common questions from resin crafters is whether UV light can cause resin to yellow over time. Here, we look at why yellowing happens, how you can minimise it, and which resins are formulated to limit the effect.

Why Does Resin Yellow in Sunlight?

Many resins are susceptible to yellowing due to UV (ultraviolet) exposure from sunlight or even strong indoor light. UV light breaks down the molecular structure of standard epoxy, gradually causing a yellow tint to develop. This effect is especially noticeable in clear resin pieces, tabletops, or jewellery, and is usually permanent once it occurs.

How to Prevent Resin Yellowing

Choose UV-Resistant Resin: Look for resins specifically formulated with strong UV filters. Products such as “Icrystal” Epoxy Resin include UV protection designed to slow the yellowing process for up to 10 years under normal use.
Minimise Sun Exposure: Whenever possible, display or store your resin pieces away from direct sunlight. Even UV-resistant products can degrade if exposed constantly.
Consider Application Thickness: Deeper cast projects often benefit from resins tailored for thicker pours, like “Epoxytable 10-Ten”, which incorporates enhanced UV resistance for large surfaces.

When This Matters Most

UV yellowing is particularly important for decorative or functional objects meant to stay clear and bright—such as jewellery, memorial keepsakes, or tabletop coatings. For these, a multipurpose clear epoxy like “Trasparente” is ideal for shallow pours and detailed work with built-in UV protection.

Related guides

How Do You Bleach Resin

Understanding how UV light affects resin empowers you to choose the right materials and aftercare for lasting clarity. For more detailed instructions and project-specific advice, see our full guide on how to manage and restore resin surfaces.