Rust Converters

[buvac@SAIL.Stanford.EDU]

How long will rust converter protect a surface,
it is NOT painted over?

This is my situation.  I am not ready to
undertake a complete paint job, but would like
to stop rust from forming on a few areas in my
trunk  (the MG's trunk, actually) where there
is no more paint (and the metal is exposed).
Would putting rust converter keep rust from
forming, until I am ready to paint the entire
car?  If not, what would you recommend?

Thanks,

SASA