Which pigments can be used in polyurethane resin?

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Can any pigment be used in polyurethane resin?

Polyurethane resin is a rewarding material for crafts, models and prototyping, but choosing the right pigment is essential for both safety and vibrant results. Here’s what you need to know before colouring your resin project.

Choosing Compatible Pigments

Pigments used in polyurethane resin must be chemically compatible to avoid issues like poor curing or uneven colour. Recommended options include interference metallic powders designed for resin, as well as specialised polyurethane-compatible colourants. General or universal pigments are not always suitable, as some may react with the hardener or compromise the finished object’s strength and appearance. For best results, opt for pigments such as the Sahara Space Interference Metallic Pigment, which is proven to work in polymer resins and delivers shimmering, beautiful effects.

Applying Pigment for Best Results

To ensure even colour and consistent outcomes, always add pigment to the polyurethane resin while it is still liquid—once fully mixed, pour immediately as many systems cure quickly. Begin with a small quantity of pigment (generally no more than around 5% of total mass) and blend thoroughly, adjusting to reach your desired saturation. Stir gently to prevent air bubbles. Excessive pigment may interfere with the curing process, so always follow both resin and pigment instructions for optimal results.

Add pigment to the mixed liquid resin before pouring
Mix gently and thoroughly without over-whipping air
Use products specifically labelled as suitable for polyurethane

When This Matters

Selecting the right pigment is particularly vital when you want reliable curing, durability and accurate colour. This is key for high-precision moulds, doming badges, and decorative pieces where clarity and surface finish are important—such as with Be Flex transparent doming resin and similar applications.

Related guides

How To Colour Polyurethane Resin

In summary, ensure you choose pigments made for polyurethane resin to achieve stunning, long-lasting colour. For more on colouring techniques and compatible materials, explore the full guide on how to colour polyurethane resin.