gases 23 the outer housing for sections 3100 and 3200 is case dependent and they are not shown in further figures the spray area 3000 is limited by the substrate 1 to be sprayed generally a paper web or fine mesh wire a generally adjustable gap 21 on incoming side adjustable gap 22 that is modified by a separate closure mechanism 4 5 6 or 7 the inner wall 2 that is generally specially coated with materials including i e teflon but can include a double wall cooled construction and an opening allowing the excess gases 23 to be removed from the box parallel and in close proximity of the wall containing the tips of the spray nozzles 3 the spraying equipment section 3100 contains the nozzles 3 spray material distribution piping 31 motive gas distribution pipe 370 and connecting tubing and control valves generally as shown in details in fig8 the separated section 3200 that is cooled with coolants including air houses all electronic control and communication means including e g the step motors for control valves 35 in fig8 the excess gases combined in a manifold type piping 7 and led through the transport piping 71 aided by pressurized gas driven valve 73 controlled ejector 72 to a separate gas washing 74 system shown in fig1 fig2 comprises of a system that applies spray onto vertically running paper web 1 supported by roller 13 creating high quality paper surface required in most demanding paper and board coating applications by evening the coated surface in two consequent doctoring steps 4 5 and 7 the first step is achieved with a hydroplaning rotating sweat roll 6 that is internally cooled 611 612 or heated to desired temperature.