Does Excess Pigment Affect Resin Curing?

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Can Too Much Pigment Affect Resin Curing?

Additive colour is a brilliant way to personalise your epoxy resin projects, but measuring pigment carefully is crucial to ensure a proper cure. Here’s what you need to know about how pigment percentages impact results.

How Pigment Levels Affect Epoxy Resin Curing

When colouring epoxy resin, it’s tempting to add extra pigment for a bolder hue. However, exceeding the manufacturer’s recommended dosage—usually below 5% pigment by weight—may disrupt the delicate curing process. Excessive pigment can prevent the resin from setting fully, leaving a sticky or soft finish. This is because too much colourant interferes with the chemical reaction that turns mixed resin and hardener into a stable, solid surface.

Practical Tips for Measuring Pigment

Always check the technical datasheet or packaging for guidance on recommended pigment quantities for your resin. For example, to avoid streaking and still achieve vibrant results, use high-coverage colourants like the Colourfun Set. Start with a small amount—just a few drops or a fraction of a gram—and mix thoroughly before deciding whether to add more. Digital jewellery or kitchen scales provide the precision needed for accurate weighing.

When This Matters Most

If you’re aiming for a strong, opaque effect, it’s easy to exceed pigment limits—so take care to measure accurately.
For transparent or stained-glass style pieces, less pigment is needed, reducing the risk of curing issues.
Large-volume pours and professional castings are especially sensitive to pigment overload; follow guidelines strictly for these applications.

Related guides

How Do You Make Coloured Resin

Keeping pigment levels within the safe range ensures your resin cures reliably and looks vibrant. To explore colour options and learn more about mixing techniques, head back to our main guide on how to make coloured resin.