Free shipping on orders over £29,85 
Shipping Tracking! 
Google
Facebook← Back to How do you colour polyester resin?
If you’ve ever coloured polyester resin, you may have noticed unwanted streaks or spots in your finished piece. Achieving a smooth, even resin colour depends on your mixing methods and pigment choice.
Mastering the Mixing Process
To prevent streaks and spots, always introduce pigments gradually into your resin. Sprinkle or pour in small amounts, stirring well before adding more. Use a spatula or stirrer to reach the sides and bottom of the container, ensuring every part of the mixture is distributed evenly. Take your time with this step—rushing can trap clumps or leave areas of unmixed colour, which often show up as streaks in the cured resin.
Choosing Pigments for Best Results
Not all colourants blend equally well. Fine powder pigments, such as mica-based pearline pigments or neon powder pigments, disperse more readily than chunky powders or pastes. Glow-in-the-dark additives, like phosphorescent pigment powders, can also be used for decorative effects if mixed thoroughly. Test on a small batch before scaling up any new pigment, so you can see compatibility and blend quality first-hand.
Practical Tips for Flawless Colour
- Mix pigment into component A (the resin) before adding the hardener.
- Work in a well-lit area to spot clumps or colour variation early.
- Use clean, dry tools for each colour to avoid cross-contamination.
When This Matters Most
Achieving even colour is especially important for clear castings, art pieces, or projects where surface finish is on show. Decorative projects using additives like phosphorescent pigments depend on consistent mixing to deliver the full intended effect.
Related products
Related guides
Consistent colouring techniques help unlock the full creative potential of polyester resin. For more on resin colour effects and creative possibilities, visit our main guide on how to colour polyester resin.