Wolfgang wrote:

In the fullness of geologic time, even planets will go bad......if
they aren't properly stored. That's really the key to the issue.
Keep the line in its original container or, preferably, in an airtight
bag, keep it away from solvents, excessive heat, light.....especially
sunlight....and continental subduction zones. It should keep for many
years.

The matter of tippet material is somewhat more controversial. With
its thin diameter and relatively high surface area to mass ration, it
doesn't take nearly as long for oxidation or evaporation to do
significant damage. That said, I've successfully used stuff that's
been around for a few years as long as it was stored with the above
criteria in mind.

In other words, no.

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