The best glue for hard plastics includes 502 glue and hot melt adhesive. 502 glue is a fast-curing, transparent, impact-resistant glue that is suitable for a wide range of plastic materials. Hot melt glue is environmentally friendly, non-toxic, fast curing glue with good adhesion and durability. When choosing, you need to consider the type of plastic, bonding area, the use of the environment, as well as the glue curing time, adhesion, durability and other properties. It is recommended to use brand reputation, quality assurance of the glue, to ensure that the bonding effect and service life.