Gasket preservative question

Originally published at Notes from the bunker…. You can comment here or there.

I was thinking, whats the best substance/material to use to preserve the rubber gaskets on ammo cans (or other waterproof containers?)

I don’t want to seal the container permanently, I simply wish to maintain the integrity of the gasket and keep it from drying out.

I was thinking some type of silicone or something. Any ideas?