Pure Linseed Oil for the woodwork - need a few coats, and gotta wait between coats to let it dry in.
Water based primer and paint for the galvanized steel part of the lids, different colour for each hive. I use leftovers that I have in the shed.
And I've got one unpainted super that I put together and used in a hurry, its actually doing OK, but I don't expect it to last as long as the others.