Abstract: Two separate indexing mechanisms, one for parts and one for shields, are operated to repetitively paint selected surfaces of parts. The mechanisms are overlapped at a paint station in which one shield and one part are mated and the part is then painted. New parts are continuously indexed into the paint station for painting. When the shield at the paint station should be cleaned, the shields are indexed so that the shield at the paint station is moved to a wash station, and at the same time a clean shield is moved into the paint station for continued painting without interruption. The booths provided for the paint and wash stations may also be periodically indexed with the shields for washing therewith.