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.