You need to be careful with what you put on the chain if you intend to have it regalvinized in the future.
A problem arises with removing coatings from chain before galvanizing. The galvanizer will pickle the chain in an acid bath to remove corrosion
and other contaminants before dipping the chain into the liquid zinc bath. If you put coatings on the chain which are difficult to remove a clean chain cannot be achieved.
If you can manage it compartmenting the chain locker so that the rusty chain is separated from the working chain and consequently remains dry and spraying it with cheap cooking oil
using a spray bottle helps a lot.
I have resorted to putting storing chain in plastic jerry cans to achieve the separation and contain the oily chain.