The 781RC MicroMark Recirculating Spray System reportedly eliminates maintenance and downtime encountered with felt pads that become contaminated with debris – or spray valves that clog with heavy pigments – by using a recirculating pump to keep pigments in suspension, and using a short burst of air after each cycle to clear the nozzle of residue. Marking inks and paints are said to perform exactly as intended. Is reliable and easy to service.