Plastics and Super glue
There are many, many different types of plastic and each behaves differently with adhesives. Some, like rigid PVC, are fairly easy to bond. Others, like polyethylene or, even worse PTFE, are almost (but not quite) impossible. Because of the differences in how each type behaves in conjunction with adhesives, the first step in choosing the best super glue for plastic is to work out what kind of plastic you need to bond.