the present invention is directed to a method and apparatus for dynamic in - line mixing of feedstocks in various delivery systems . the apparatus of the present invention includes an agitator housed within the delivery conduit that is constructed and arranged to impart motion to feedstock passing through the delivery conduit to a discharge device . the method of the present invention is particularly well suited for maintaining metals and other solids in suspension during delivery for specialized coating and / or painting applications . systems employing the apparatus and method of the present invention are also disclosed .