Colored silicone sealants are made in an apparatus by (i) programming a central computer (100) to control the operation of a mixing device (33) and a plurality of dosing units (1-12) actuated by a ball screw table/servo-motor mechanism (50); (ii) supplying sealant base and pigments to the dosing units; (iii) activating the ball screw table/servo-motor mechanism in response to signals from the computer; (iv) metering predetermined volumes of sealant base and pigments at a predetermined rate; (v) conveying metered portions to the mixing device; and (vi) dispensing colored silicone sealant into a cartridge (31).