A method for defining arrays of specific areas of porous nitrocellulose based pads on a substrate directly without the need for removal of nitrocellulose in unwanted regions; covering said substrate with a removable frame constructed out of 3-4 mm silicone rubber; using a dispensing station, consisting of a XYZ robot, multi-channel syringe pump, and dispensing head comprised of an array of flat hypodermic syringe needles, to spread the nitrocellulose-based solution in a programmed fashion onto said substrate covered by said removable frame.