An applicator for delivering a glutinous substance to a workpiece from an end-effector, the applicator comprising: a body, comprising: a first channel that comprises an inlet portion, comprising an inlet through which the glutinous substance enters the applicator, and an outlet portion, comprising an outlet, through which the glutinous substance exits the outlet portion, wherein the inlet portion is communicatively coupled with the outlet portion and at least a part of the inlet portion is oriented at an angle to the outlet portion, wherein the angle is other than 180 degrees; a second channel, communicatively coupled with the first channel and coaxial with the outlet portion of the first channel; a sensor port, communicatively coupled with the first channel; a plunger, comprising a plug movable within the second channel and a gate, wherein the gate is movable within the outlet portion of the first channel between, inclusively, an open position, allowing the glutinous substance to flow from the inlet of the first channel to the outlet of the first channel and a closed position, preventing the glutinous substance from flowing from the inlet of the first channel to the outlet of the first channel; an actuator, selectively operable to move the plunger such that the gate moves between, inclusively, the open position and the closed position; and a sensor, communicatively coupled with the first channel via the sensor port and configured to detect at least one characteristic of the glutinous substance in the first channel; and a second sensor, communicatively coupled with the first channel; the sensor is configured to detect a first characteristic of the glutinous substance, wherein the second sensor is configured to detect a second characteristic of the glutinous substance; and the first characteristic of the glutinous substance is different than the second characteristic of the glutinous substance. a body, comprising: a first channel that comprises an inlet portion, comprising an inlet through which the glutinous substance enters the applicator, and an outlet portion, comprising an outlet, through which the glutinous substance exits the outlet portion, wherein the inlet portion is communicatively coupled with the outlet portion and at least a part of the inlet portion is oriented at an angle to the outlet portion, wherein the angle is other than 180 degrees; a second channel, communicatively coupled with the first channel and coaxial with the outlet portion of the first channel; a sensor port, communicatively coupled with the first channel; a first channel that comprises an inlet portion, comprising an inlet through which the glutinous substance enters the applicator, and an outlet portion, comprising an outlet, through which the glutinous substance exits the outlet portion, wherein the inlet portion is communicatively coupled with the outlet portion and at least a part of the inlet portion is oriented at an angle to the outlet portion, wherein the angle is other than 180 degrees; a second channel, communicatively coupled with the first channel and coaxial with the outlet portion of the first channel; a sensor port, communicatively coupled with the first channel; a plunger, comprising a plug movable within the second channel and a gate, wherein the gate is movable within the outlet portion of the first channel between, inclusively, an open position, allowing the glutinous substance to flow from the inlet of the first channel to the outlet of the first channel and a closed position, preventing the glutinous substance from flowing from the inlet of the first channel to the outlet of the first channel; an actuator, selectively operable to move the plunger such that the gate moves between, inclusively, the open position and the closed position; and a sensor, communicatively coupled with the first channel via the sensor port and configured to detect at least one characteristic of the glutinous substance in the first channel; and a second sensor, communicatively coupled with the first channel; the sensor is configured to detect a first characteristic of the glutinous substance, wherein the second sensor is configured to detect a second characteristic of the glutinous substance; and the first characteristic of the glutinous substance is different than the second characteristic of the glutinous substance.