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SO-Strong tints

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Smooth-On is one of the worlds leading manufaturers 3D modeling materials such as mold-making, casting and special effects materials but also industrial casting resins, adhesives and equipment. FormX is main distributor of Smooth-On products in Europe.

SO-Strong tints

SO-Strong™ liquid urethane colorants can be added to any Smooth-On liquid urethane rubber, urethane plastic or urethane foam (do not use with Smooth-On silicones). They can be used to create a variety of color effects for a wide range of material applications. For glowing fluorescent color effects, use Ignite™ colorants.


colorants are highly concentrated, offer excellent dispersion and consistent color. A very small amount will color a proportionally large amount of liquid urethane material. The more you add in proportion to the volume of liquid urethane, the more dramatic the color effect. Recommended loading range is .01% to 3% of total system weight. Do not overload the liquid urethane system or cure inhibition / oozing may occur.

User determines amount to add; If this is your first time adding color tint or pigment to a urethane system, you may want to test the color effect by adding a few drops to a small amount of urethane material and observe the outcome. It may take a few test castings to attain the desired color outcome.

Technical bulletin SO-Strong colorants


SO-Strong Pigments

  • SO strong white /60ml

    SO strong white /2oz

    23,40 EUR (incl. 21% VAT plus Versand)

  • SO-Stong Black /60ml

    SO-Stong Black /2oz

    21,05 EUR (incl. 21% VAT plus Versand)

  • SO-Strong Blue /60ml

    SO-Strong Blue /2oz

    21,05 EUR (incl. 21% VAT plus Versand)

  • SO-Strong brown /60ml

    SO-Strong brown /2oz

    30,35 EUR (incl. 21% VAT plus Versand)

  • SO-Strong Green /60ml

    SO-Strong Green /2oz

    23,62 EUR (incl. 21% VAT plus Versand)

  • SO-Strong orange /60ml

    SO-Strong orange /2oz

    23,34 EUR (incl. 21% VAT plus Versand)

  • SO-Strong Yellow /60ml

    SO-Strong Yellow /2oz

    21,05 EUR (incl. 21% VAT plus Versand)

  • SO-Strong flesh color /60ml

    SO-Strong flesh color /2oz

    23,40 EUR (incl. 21% VAT plus Versand)

  • SOStrong Red /60ml

    SOStrong Red /2oz

    21,05 EUR (incl. 21% VAT plus Versand)

  • SO-Strong Violet /60ml

    SO-Strong Violet /2oz

    24,56 EUR (incl. 21% VAT plus Versand)

  • SO-Strong Black /500gr

    SO-Strong Black /16oz

    140,65 EUR (incl. 21% VAT plus Versand)

  • SO 9 color sampler

    SO 9 color sampler

    41,22 EUR (incl. 21% VAT plus Versand)


To get you started, we offer the following colorant loading levels. Results may vary.

By Weight Using A Gram Scale: Add SO-Strong™colorant at a ratio of between 0.01% - 3% of the total weight (Parts A + B mixed) of the material being cast. Adding more than 3% by weight may cause cure inhibition.

By Volume Measured In Drops: Add 10 drops of SO Strong™ (88 ml) of mixed urethane material. If using a translucent material (like Smooth-Cast™ 325) you can use 1 drop to maintain translucency of the material.

Directions For Use: Store and use at 23°C. Wear vinyl gloves to prevent skin contact. After dispensing the required amount of urethane material Parts A and B into measuring containers, add colorant to Part B and mix thoroughly. Combine Parts A and B into a mixing container and mix as directed by the urethane product technical bulletin.

Blending Colors: Combine different colors on a palette to create a custom color before adding to material as directed above.

The Pantone Color Matching System is most commonly used in the printing industry to communicate color. As it relates to Smooth-On color tints and pigments, the represented color is an approximation and people’s interpretation of these colors may vary. The user will determine suitability of a color or combination of colors for the rubber, resin, foam or other product used specifically for their application. Due to the variability in products that are being colored, application, color concentration and other factors, Smooth-On makes no warranty with regards to the color.



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