How to preserve organic polymer?

I'm constantly on an org poly shortage in SP (cannot make kairuku farms due to breeding cooldown time) and honestly I do not wanna be crafting thousands of normal polymer. Is there any way to extend the spoil timer of org poly, since you cannot put them in fridges? If not, what is the best way to mass farm tons of polymer? Cuz I farmed majority of the obsidian in the snow mountain and volcano, and they take forever to respawn, same going with Kairuku.