Hot melt is the name given to any polymer-based glue that is applied in a molten state. The application of the adhesive is usually by an industrial glue gun, which works through either trigger action or finger pressure. Hot melt is used in a variety of settings due to its versatility, including packaging, bookbinding, carton-making, graphic arts, tapes and labels, product assembly and in the automotive industry.

Hot melt is appealing for many reasons. For one, it is fast-acting. In fact, the time to cure, or set, can be adjusted based on the needs of the job. Hot melt is safe to use and environmentally friendly. In addition to bonding difficult surfaces, hot melt can also be used to fill gaps. It is also easy to ship and store.