Can I Colour Polyurethane Coating or Casting Resins?

Which Polyurethane Resins Can Be Coloured?

If you want to tint polyurethane resin, choose a formulation designed for this purpose. For example, IWhite Polyurethane Casting Resin can be tinted with compatible dyes or pigments while in its liquid state. Once cured, pieces can also be painted with acrylics for extra detail or effects.

On the other hand, some resins are not made for tinting. Products like Polyform (a beige, fast-setting casting resin) and Polirock (a binder for outdoor stones) are not suitable for adding colour during mixing. Attempting to colour these could affect performance or result in an uneven finish.

How to Colour Polyurethane Casting Resins

When using colourable polyurethane like IWhite, add your chosen liquid or powder pigment to the combined A and B components and mix thoroughly until the colour is uniform. Always use pigments compatible with polyurethane to ensure an even, bubble-free result and avoid weakening the cast.

• Mix pigments in small amounts until the desired shade is reached
• Check for even blending to avoid streaks
• Test a sample before casting larger pieces

When Colouring Matters Most

Colouring is especially important for creative resin artists, model makers, or crafters seeking a custom finish right out of the mould. Prototyping projects that benefit from colour coding or unique effects also rely on tintable resins for efficient workflow and presentation.