Baggsy,
My opinion is that exposing your kite to UV's to dry it or letting it flapping in the wind
are worst than keeping it wet from saltwater.... Also, if you kite a lot, you'll spend your life washing it!
I haven't washed a kite for three years; (edit: I do wash it at the end of the season)
I do not leave it unnecessarily in the sun;
I do not leave it unnecessarily in the wind...
My kites are still living and flying...
However, I might be wrong and my kites could just be very strong!
Fred