This shear spray system is designed as a modern and economical replacement for the 502-301 single line shear spray unit. The system comprises the control unit which incorporates an emulsion mixing unit. The mixing unit is capable of providing oil/water ratios from 1:100 to 1:1800. The upper part of the control cabinet houses the electronics in a sealed enclosure to ensure maintenance with water and oil can be carried out without risk to the system or personnel. For convenience of adjustments and to allow local shut-off of emulsion mix and air, a separate distribution box is supplied, to be mounted near the shear mechanism. The distribution box provides an air regulator for spray air and a single flow meter for the spray emulsion. A shut-off valve and connection for the gob spray unit is also provided.