Step-by-step guide for seamless, vibrant resin colouring

Adding colour to polyurethane resin opens up endless possibilities for creative makers, model builders, and crafters. This guide covers how to achieve consistent, vibrant results safely and reliably, helping you avoid common colouring pitfalls. Whether you’re crafting miniatures, jewellery, or functional parts, you’ll learn the best practices for tinting and finishing polyurethane resin.

What You’ll Need

• “IWhite” – Polyurethane Casting Resin – White, Fast-Curing Two-Part System: Ideal for precise replica casting and craft models.
• “Sahara Space” – Interference Metallic Pigment, 10g: Offers a selection of metallic shades, suitable for both subtle and bold effects.
• “Be Flex” – Transparent Polyurethane Doming Resin – Scratch-Resistant: Useful as a clear topcoat or for doming coloured resin items.
• Disposable mixing cups
• Mixing sticks or spatulas
• Protective gloves and apron
• Clean workspace with adequate ventilation

Visual Inspiration: Colourful Polyurethane Resin Projects

Explore creative possibilities with coloured polyurethane resin—from shimmering metallic effects to bold opaque hues. Use Sahara Space Metallic Pigments for unique sparkle in your next casting or decorative project.

Step 2: Measure and Mix the Resin Components

Accurate measurement is critical for successful curing. Follow the instructions for your chosen resin precisely – for example, the “IWhite” – Polyurethane Casting Resin – White, Fast-Curing Two-Part System requires mixing equal amounts of part A and part B. Use clean, dry containers for both parts. Mix slowly and thoroughly with a spatula, scraping the sides and bottom to ensure uniformity and avoid introducing excessive air bubbles. This creates an even base for adding colour.

Step 4: Cast, Doming, and Finishing Techniques

With the pigmented resin ready, pour or cast it into your prepared mould or shape. Take care to minimise air bubbles—pour slowly and tap the mould gently if needed. Smooth any surface imperfections while the resin is still workable. For projects that require a glossy, protective finish or a domed effect (such as badges or stickers), once curing is complete you can apply a coating of “Be Flex” – Transparent Polyurethane Doming Resin – Scratch-Resistant. This adds a flexible, durable surface, ideal for curved or exterior-facing applications. Always allow the initial coloured resin to fully cure before adding any topcoat.

Tips and Troubleshooting

To avoid cloudy or unevenly coloured resin, always use suitable pigments for polyurethane and mix thoroughly before pouring. If air bubbles appear, tap or gently warm the mould to bring them to the surface. Too much pigment or the wrong type may affect the resin’s structure or inhibit curing—so always test unfamiliar brands on a small scale first. Store pigments and part-used resins in tightly closed containers, away from humidity and direct sunlight, to maintain their properties.

Showcase: Expert Resin Finishing Techniques

Achieve flawless doming and eye-catching finishes by applying Be Flex Transparent Doming Resin as a flexible, high-gloss coat over any coloured surface.