Painting is recognized as the mainstay for preventing corrosion of structural components or systems and decorating objects. Paint is a heterogeneous liquid solution of many solid components that is daily needed to be blended in large quantities to requisite homogeneities and properties in many industries and units before application to ensure consistencies in the desired paintwork qualities and reliable effective corrosion protection at economical costs. Efficient and fast mixing of paint is done by mechanical agitation. Mechanical agitation also removes the drudgery of human folk in blending large quantities of paint and reduces exposure time of personnel to some paints that are toxic. No universal system till now has been found valid for agitating paint and other fluid quantities in different container sizes and shapes. For optimal functionality, efficiency, productivity, reliability, and economy agitators are usually not mass-produced and kept in storage but designed and developed to meet individual customer’s requirements. Design specifications of agitators for mixing paint can be different from those of other liquid solutions for the same mixing quantities due to distinctiveness of paint properties such as viscosity, density, segmentation level, and environmental susceptibility. In this paper, some previous revolutionary works on means of agitating fluids are reviewed to provide a compendium of basic concepts that need to be understood for meaningful advancements in designs of mechanical agitators to optimally meet various paint mixing requirements with given equipment sizes and shapes. The review showed that the required mixing quantity per unit time, shape and size of paint container, impeller size and rotational speed, shaft strength, powering system, agitation time, and, structural anchorage system for the container are the basic design parameters for the agitators. These parameters along with basic considerations such as: ease of operation, operational efficiency and integrity, reduction of agitation time, cost reduction, reliability, durability, safety, reduction of paint exposure time to environment, ease of paint pouring in and out of containers and, easy means of loading heavy paint containers in place and unloading them were seen to be crucial in advancing the agitator designs.