Colouring and Painting Polyurethane Resin Castings

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Polyurethane resin castings offer exceptional flexibility when it comes to customisation. Whether you aim to achieve rich colours straight out of the mould or prefer to add painted details later, these resins can be both coloured and painted to meet a variety of creative needs.

Colouring Polyurethane Resin Before Curing

Adding colour to polyurethane casting resin while it is still in its liquid state is a popular way to achieve solid, consistent colour throughout the final piece. Specially formulated resin pigments or compatible colour pastes mix easily into the resin before pouring. Use small amounts at first, as colour can be intense, and mix thoroughly for even distribution. This approach is ideal for model makers, crafters, and artists seeking a uniform look for their projects using products such as the “IWhite” Polyurethane Casting Resin.

Painting Polyurethane Castings After Curing

Once fully cured, polyurethane resin castings can be painted using acrylic paints or other suitable coatings. For best results, ensure the surface is clean and lightly sanded to help the paint adhere. This method is especially useful for adding fine details, highlights, or unique effects to figurines, jewellery, or decorative pieces after demoulding.

When Does Colouring or Painting Matter Most?

• Model making and figurines: Achieve detailed finishes and colour fidelity.
• Custom decor and art: Reflect personal style or complement existing interiors.
• Gift making and prototypes: Distinguish or brand designs with unique colours and effects.

Related products

• “IWhite” – Polyurethane Casting Resin – White, Fast-Curing Two-Part System

Related guides

• What Is Vinyl Resin Made Of

Whether you choose to colour your resin before casting or paint it once cured, polyurethane systems provide excellent creative control. To learn more about the chemistry of vinyl and other resins, visit our main page: What is vinyl resin made of?