Abstract: In an automatic paint spraying apparatus automatic control means comprises two parts, the first part providing programmable control means for determining a desired sequence of operations and the second part comprising position indicating means for generating an electrical digital signal representing the position of a spray gun and comparator means for comparing the signal from the position indicating means with reference signals determining the sequence of operation and providing an output for use in controlling the spray guns, the second part of the automatic control means being arranged for location within a paint spraying area having an hazardous atmosphere.