Glue Pellets for hot melt gluing system that adds a layer of adhesive to media. The sheets can then be added one-by-one to create a thick substrate that can be used for many applications, including book covers and luxury, high quality business cards. gluing system. Place approximately half of the adhesive pellets in the front of the tray. You do not need to wait for the pellets to melt before using. The bags are made from a special material and is dissolvable in the hot adhesive.