pressure minimizes or eliminates mist from exiting the spray chamber and can be set to minimize the draw of ambient air into the spray chamber 22 at any open draft areas between the spray chamber the backup roll 14 and the web 12 suitable air pressures inside the spray chamber can be between about between about u2212 0 001 inches of water gage to about u2212 0 50 inches of water gage or between about u2212 0 001 inches of water to about u2212 0 1 inches of water gage in some embodiments u2212 0 032 inches of water gage and u2212 0 05 inches of water gage are used the optional entry gas curtain 24 and the exit gas curtain 26 can be used to further contain any mist within the spray chamber the gas curtains may be located either inside or outside of the spray chamber suitable gas curtains can include air knifes air bars or air nozzles that can provide a substantially homogenous line of gas across the cd width of the flexible web or spray chamber in one embodiment air knifes such as the standard air knife or the super air knife manufactured by exair corporation located in cincinnati ohio have been used successfully in another embodiment regenerative blowers and sheet metal nozzles can be used to provide the entry and exit gas curtains the cd uniformity of the entry gas curtain 24 is less critical since its main function is to prevent liquid and mist from exiting the spray chamber 22 with sufficient exhaust air flow or for an apparatus located.