Storing tins in a damp environment

[Highlander]

I use a variety of containers for outside use,..

think large paint tubs, look up your local painter and decorator, he would be please to see you take his empties,..also the same sort of container that hold fence preservative, or go to your local hotels and ask for their containers that they get cooking oil delivered in.
I even ask the farmers to save me the container that hold the sheep licks in,...all these items are thrown away after use