Gluing — Sticking With Direct Mail

Water-soluble glue applied on a pattern gluer can do this, too, but since pattern gluers rely on timed entry rather than motion sensors, its application isn't as precise. In addition, extrusion hot melt glues rarely curl paper and generally have a professional appearance, while cold-applied glue looks duller, may have ragged edges and tends to curl, since moisture is being added to only one side of the sheet.