Smooth-Cast® 325, 326 & 327 ColorMatch® Series are fast-cast resins that were developed specifically for adding color pigments and fillers to achieve true color representation or filler effect. The ColorMatch® Series is formulated “color neutral”. Small amounts of pigment will yield accurate, vivid colors from cured castings (use of Smooth-On pigments is highly recommended). The ColorMatch® Series offers the convenience of a 1A: 1B mix ratio by volume and has a very low viscosity. Demold times range from about 10 minutes to 2-4 hours (depending on product, mass and mold configuration). SC 325, 326 & 327. Note; Large mass castings will get very hot and shrink more, depending on mold configuration.