I doubt superglue would do anything useful, since it dries up very brittle.
White PVA glue in a 1on1 water solution however will provide a thin and permanently flexible coat that will hold paint quite well. It will also double as a varnish finish, since it dries up colorless and matt.
Mind, not all 1/72 plastic figures will need this, but it will work on all kinds of soft flexible plastic. Some of which will refuse to attach to any kind of paint or glue. The old ESCI were extremely terrible in that regard. The new HaT figures will accept any primer. So some trial and error is to be expected.