How Much Pigment to Add to Polyurethane Resin

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How Much Pigment Should I Add to Polyurethane Resin?

Adding pigments to polyurethane resin is a popular way to enhance your castings with custom colours or striking effects. However, achieving the perfect result depends on using the correct pigment ratio.

Recommended Pigment Dosage

To avoid compromising the performance of your polyurethane resin, it’s best to limit pigment addition to no more than 5% of the total mass of the mixed resin. Excess pigment can interrupt the curing process or affect structural integrity, leading to weak or inconsistent results. Always weigh your resin and pigment for accuracy, especially with fast-curing options such as the “IWhite” Polyurethane Casting Resin.

Tips for Even Colour and Vibrancy

Begin with a small amount of pigment—add little by little and mix thoroughly until the desired depth is achieved, without exceeding the recommended total.
Choose pigments designed for use with polyurethane or epoxy, such as interference metallic or mica powders.
Stir the mixture gently to reduce bubbles and ensure the pigment disperses fully before pouring.

For metallic effects or richer tones, products like Sahara Space Interference Metallic Pigment are a practical choice.

When This Matters: Preserving Resin Quality

Careful pigment measurement is crucial for projects where detail and durability are key. If you’re making small models, badges, or decorative elements that require crisp definition and a flawless finish—especially with rapid-curing resins—sticking to the recommended ratio ensures consistent results every time.

Related guides

How To Colour Polyurethane Resin

Staying within the advised pigment limits helps maintain both the beauty and performance of your polyurethane resin creations. For more guidance on working with colour in resin projects, visit our main guide on how to colour polyurethane resin.