A machine and method for finishing parts, having part-isolating means such as vertical partitions or dividers, defining one or more compartments, disposed at least partially within the finishing chamber, each compartment designed to accept a part or parts to be finished and to maintain parts isolated from other parts. The finishing chamber and the part-isolating means are movable with respect to each other. As a result, as the part moves along the finishing chamber during the course of the finishing process, the compartment defined by the part-isolating means, e.g., partitions, moves longitudinally with the part and isolates it from other parts.