During fabrication of shielded radio-frequency modules where costly metallic paint is sprayed to form a conductive layer, it is desirable to reduce the amount of paint being utilized, and to reduce the likelihood of accumulation of metal particles along various paths. A closed recirculation system can be provided to yield such desirable features, and can include a reservoir for holding a volume of metallic paint, a spray apparatus for spraying metallic paint received from the reservoir, and a recirculator for recirculating the metallic paint that is not sprayed back to the reservoir. In some embodiments, the spray apparatus can be implemented so as to have reduced dimensions, and include a mechanism for switching between a spray mode and a recirculate mode. Such a spray apparatus can reduce the amount of paint being utilized, and also reduce accumulation of metal particles in the spray apparatus.