The device comprises an elongate chamber (15) having shaped walls to promote mixing of the components, a rotatable rod (22) extending along the length of the chamber (15), and at least one port (27) for simultaneously injecting the components into the chamber (15). The chamber walls may be fluted or provided with ribs to promote mixing. The chamber is closed at one end by a suitable plug (17) through which the rod (22), rotatable by an electric motor (26), extends. IMAGE
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