Ansley W. Sawyer wrote:
Peggy,

How long does KO last in an unopened bottle?

At least a year if it's not exposed to temps above 110 or below 40 F. It
should be fine stored anywhere on a boat except during winter
storage...or as long as it wasn't left in a dock locker exposed to the
sun or anywhere else where solar heat can "cook" it.

--
Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://shop.sailboatowners.com/boat_odors/