Gummed paper is a type of kraft paper that has as water-activated adhesive, often dextrin on one side. It is usually sold on rolls used for sealing shipping cartons. Using this tape makes it easier to wind tubes or to paste layers of paper over a round shell. Typical widths are 1 to 4 inches. Three inch width is probably the most common. A damp sponge is often used to activate the adhesive.