and yes, your theory sounds good to me. I did a whole post on sweat, full of bad science(i found out later, be sure to read V's reply to the post), but it's got some good links in it...
gonna go get it, BRB:)
EDIT-
ok, this is more about the sun but...please disregard my bad science:) I do that often, I do state when it's conjecture though and I LOVE to be corrected!