Preserving PG/VG over time

[Nightshard]

I have large quantities of PG and VG.
What is the best way to preserve them over time?
How much time can they be held before going bad?
Would it change if they are mixed with each other or with nicotine?

 

[Myk]

I don't think PG goes bad, not sure.

I keep my VG in the freezer in canning jars. As needed separate those into 30ml bottles like the nicotine liquid so I'm not always warming them up and exposing them to air.

 

[AmandaD]

Mine's also in the freezer, except for what I'm using, which is just in plastic bottles in my DIY box