electric motor 70 and gearbox the mixing vessels and the rest of the wet masking system 60 is airtight to prevent volatization and evaporation of the binder suitable mixing vessels are stainless steel pressure vacuum tanks available from sealant equipment 45677 helm street p o box 701460 plymouth mich 48170 usa after the first and second mixing vessels 62 64 are filled the maskant is flowed through third lines 80 opened and closed by a third shutoff valve 82 to a volumetric metered dispensing system 88 when the maskant is required for application the air pressurized third lines transport the maskant into the dispensing system 88 the dispensing system 88 disclosed herein includes first and second volumetric metering cells 90 92 each of which includes a cylindrical cavity with pistons driven by a servo motor and feed screw the metering cells are capable of supplying and dispensing accurate volumes of the maskant the metering cells contain pressure transducers which verify presence of the maskant before dispensing the maskant the maskant is transferred from the first and second volumetric metering cells 90 92 through high pressure first and second transfer lines 99 101 to first and second injection valves 94 96 illustrated in greater detail in fig4 and 5 the first and second injection valves 94 96 are activated when the turbine blade 10 is mounted in the fixture 30 and the fixture 30 is mounted on a rotary table 98 of the masking system 60 the first and second injection valves 94 96 include first and second maskant plenums 95 97 mounted on linear first and second.