several components are used in combination to effect an apparatus for a spray system , which improves the transfer characteristics and efficiency of polymer applied to the surface of a printing plate . in accordance with this invention , the apparatus comprises : a nozzle for spraying a solid stream of polymer , a circumferential conduit surrounding the polymer spray that carries heated , high - pressure air , which heats , atomizes and improves the transfer efficiency of the polymer , a mixer that allows the mixing of the polymer &# 39 ; s constituent reagents immediately prior to the polymer entering the spray nozzle , a fast shut - off valve that allows precision control of the spray nozzle &# 39 ; s output , a shroud equipped with vacuum to remove and recycle “ overspray ”, and a cleaning arm , equipped with a vacuum , that may be activated to clean unused polymer from the components of the nozzle , and to prime the spray nozzle with fresh polymer .