Thank you Frank. I have been trying to get the words correct for over a year. I have now posted your definitive version on the Mudcat Perm-thread in which I am collecting Spanish Civil War songs: thread.cfm?threadid=128093#2864188 You can access the section about Hasta Luego by clicking on the title in the Songlist.
There is a link there to Frank's YouTube recording of the song and to Myspace where some of his other songs can be heard.

Geoff