Hot glue

A fast-setting adhesive stick melted through a glue gun, popular with costume makers for quick bonds on foam, fabric, and lightweight trims.

Hot glue is a thermoplastic adhesive that comes in solid sticks of varying diameters. You feed a stick into a glue gun, which melts it and pushes the liquid adhesive out through a nozzle. The glue cools within seconds to form a flexible, semi-rigid bond. Because it sets so quickly, it suits fast assembly work — attaching trim to a corset, bonding craft foam pieces, or tacking lightweight embellishments in place before a more permanent fix. The bond strength hot glue offers is generally good for lightweight materials but limited on heavy loads or slick surfaces like smooth plastics and metal. On porous materials such as fabric, foam, and card, it grips well. On non-porous surfaces the hold can be weaker, and the joint may pop apart under stress. Temperature also matters in use: a finished prop left in a hot car or under strong stage lighting may soften and fail at glued joints, so consider a more heat-resistant adhesive for pieces that will sit in warm environments. Hot glue comes in low-temperature and high-temperature formulations. Low-temperature guns run cooler and are often recommended for beginners and younger makers because the risk of a serious burn is reduced, though the glue can still burn skin. High-temperature guns produce stronger bonds but the molten adhesive is significantly hotter. Check the packaging of both your gun and your sticks to make sure they match, and be aware that not all sticks work equally well in every gun. Safety is straightforward but important. Always treat the nozzle and any freshly applied glue as hot — even a brief touch can cause a burn. Work on a heat-safe mat and never leave a plugged-in gun unattended or resting on a flammable surface. If hot glue lands on skin, cool it under cold running water straight away, don't peel it off, and get medical help for anything more than a small burn. Younger makers should work with adult supervision, and low-temperature guns are the sensible starting point. If you are adding electronic components or using solvent-based paints near hot-glued joints, finish the gluing stage first and let everything cool completely before moving on. For cleaner results, let the gun warm up fully before you start, and work quickly once the bead is laid — trying to reposition pieces after the glue has begun to cool usually weakens the joint. Fine threads of cooled glue, called stringing, are almost inevitable; a quick pass with a heat gun on a very low setting or gentle rubbing once fully set will remove most of them without damaging the work underneath.