Glue gun is used to push the adhesive sticks through force for melting purpose. The plastic glue is melted inside it by a continuous-duty heating element, which the user then forces through the pistol with either a mechanical trigger mechanism or by using direct finger pressure. The adhesive is clean and simple to use because it leaves no residues, doesn't overflow, and dries quickly. Sticks are composed of ethylene vinyl acetate (EVA), amorphous poly alpha olefin (APAO), or polyamide when it comes to thermoplastic polymers (PA). Glue gun has a compact structure which is easy to handle and use.