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SO-Strong® liquid urethane colourants 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 colour effects for a wide range of material applications. For glowing fluorescent colour effects, use Ignite colourants.

SO-Strong Colour Chart

SO-Strong® colourants are highly concentrated, offer excellent dispersion and consistent colour. A very small amount will colour a proportionally large amount of liquid urethane material. The more you add in proportion to the volume of liquid urethane, the more dramatic the colour effect. Recommended loading range is .01 per cent to 3 per cent of total system weight. Do not overload the liquid urethane system or cure inhibition / oozing may occur. If this is your first time adding colour to a urethane system, it is recommended that you test the colour effect by adding a few drops to a small amount of material and observe the outcome.


Product Name Net Weight
SO-Strong: Black57 gms
SO-Strong: Blue57 gms
SO-Strong: Brown57 gms
SO-Strong: Flesh113 gms
SO-Strong: Green57 gms
SO-Strong: Orange57 gms
SO-Strong: Red57 gms
SO-Strong: Violet57 gms
SO-Strong: White127 gms
SO-Strong: Yellow57 gms