I've talked to two different FBOs and a few IAs. They have all told me
that urea doesn't cause corrosion. The IAs work on a/c based at an
airport that uses urea, and they see no difference in the airframes and
such of those a/c flown during the winter when urea is in use and those
that are hangered and only flown in "good weather".

I also use it on the sidewalks and driveway where I live. Grass seems
to like it much more than salt.

Later,
Steve.T
PP ASEL/Instrument