Also known as 'hot melt adhesive' glue sticks come in a variety of sizes, strengths and colours as well as types of plastic. Acrylic glue sticks, for example, are designed to work with most thermoplastics like Plexiglass, polycarbonate plastic, ABS and others.
Welding rods are used in plastic welders which use heat to fuse or rebuild thermoplastics such as ABS, PC, PP and PVC. Rods are specific to the plastic being welded. With welders it's possible to fill small holes and rebuild keels in kayaks and canoes.
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20 adhesives x 15 types of plastic.