pva
You need polystyrene glue, commonly available in model store or hobby stores.
only the best GORILLA GLUE
Super glue or epoxy make the best Christmas repairs. Since reindeer are made of fiberglass the epoxy rebonds the fiberglass with one another. Super glue is another alternative.
with super glue
get the strongest glue in you town and then glue it back together
I use super glue or point shoe glue
by gluing with super glue or Elmer's glue
Glue is an adhesive that can temporarily connect two items together for a 'quick fix.' Superglue is stronger than regular glue and generally is used for a more permanent fix.
Super glue or crazy glue is best.
you need super glue
That's a very vague question -'plastic' covers over a hundred different materials !In most cases if it's a rigid plastic, epoxy will cover most repairs. If it's flexible as many plastics are then you have to be more specific about which plastic.
Glue it.