Systems/techniques are provided for facilitating vertical seam sealing devices for metal roofs. In various embodiments, a device can comprise a frame having a handle. In various aspects, the device can comprise one or more carriage guides extending downward from the frame and configured to mate with a vertical seam of a metal roof. In various instances, pushing or pulling on the handle while the one or more carriage guides are mated with the vertical seam can cause the frame to ride along the vertical seam. In various cases, the device can comprise a set of rollers coupled to the frame and configured to dispense sealing material onto the vertical seam as the frame rides along the vertical seam.