How long will, Lure, bait, and urine last. If kept in a cool dark place?

I don't think there is an expiration on my lures. The only exception is the skunky lures. The skunky odor will diminish over time. It can be refreshed buy adding a drop or two.
I have used some Backbreaker that dad made and is 27 years old. It works just fine.

Wow! That’s impressive

Agree on skunky lures losing their punch after awhile.
I buy some each year and some are leftover from previous year or even two. Skunky lures can lose their punch for sure. Other like beaver castor don’t seem to ever go bad for me.
Jim

Somewhere I read that if an alcohol is used for antifreeze, by the next season the lure will be a lot weaker? He recommended using certain lures up during the season.

I noticed that last year with a LDC I use, that it lost the
skunky smell, tried mixing it up the smell just wasn't
there anymore.

A well made lure will improve with age.
Some lures require aging to work best.

I have 4 0z bottle of I bielve Dunlap's cook lure. In glass. Glow in dark I think. From 3-4 yrs ago . Never open. Anyone heard it ? This first season I have not order a thing in months for trapping. Except got fish for bait an or hip boots I bought a few months back

I bought some of Vern Cunnigham's lure from Wiss Miss last year,maybe 20 years old? Caught several B'cats ,have some left for one more go'round!

This is off subject from topic. Anyone know what could be used in place of coon gland lure for late season ? Ldc call lute or red fox gland call ? The kind with skunk essence ? I got 4 oz bottle of red fox gland call that has skunk o, the maker is pass away. From ny.. grimshaw lure ? I still have some his beaver lure left but it does not have castor smell an in plastic store for yrs . Has tongue ingredient in it

never had a problem, old lure,

Until the steel cap on the glass bottle rots off.

Lure is like sour cream. Its already bad to begin with. Stink is the draw. More stink, more draw.