Yeah, this is a trick I learned building model planes as a kid. I use tube glue along edges, smooth it a bit with a penknife, and squeeze. Some pushes out, and I just drag my fingertip to wipe off the bead, which eliminates sanding since I just drag the penknife blade across the seam when the glue has dried. It solves seams without greenstuff, and has never let me down.