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When colouring resin grout for marble, getting the pigment ratio right is crucial for reliable strength, cure, and colour results. Here’s how much colourant you can safely add—and why it matters.
Recommended Maximum Pigment Ratio
To maintain the integrity and durability of your resin grout, never exceed 5% pigment by total resin mass. This means if you’re mixing 1kg of resin and hardener, the combined weight of all added colourants—whether powders, pastes or liquids—should not go over 50g. Using more can weaken the grout, affect its ability to set, and result in unpredictable finishes.
How to Measure and Mix for Best Results
For most grout colouring, a little pigment goes a long way. Start with 1% for subtle, translucent hues, and add gradually for deeper shades, but always stay below the 5% mark. Weigh out resin and hardener first, then measure your colourant before blending thoroughly into the resin part prior to adding hardener. Stir until fully uniform. For strong, vibrant tints designed for resin, specialist products like the Renaissance Set of Dyes ensure excellent coverage and easy, precise dosing.
When Staying Below 5% Matters Most
Staying within the recommended pigment ratio is especially important when working on high-traffic marble surfaces or projects requiring both aesthetic quality and long-term durability. Overloading the resin with colourant can lead to a weak or sticky grout that fails to cure properly, reducing both strength and appearance.
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By following the 5% colourant limit, you’ll achieve beautiful, lasting results with your resin grout on marble. For more tips and techniques on customising marble grout, return to our main colouring resin grout for marble guide.