The Hornaday one shot case lube can be left on the case and provides some protection. Only problem I have had is neck welds between neck and bullet. Wax or lubricant even dry ones usually prevent this. For real long storage the primers can be sealed with nail polish or a special lacquer made for this, similar to the red coating on some military loads. Have used baggies and they work, I bet vacuum sealing would be even better.
When I clean cases with Never Dull it appears it leaves behind some lasting tarnish protection, it also doesn't make the cases slippery enough to give false pressure readings like some oils will.
Only time I had a real problem was when some ammo was near a container of muriatic acid, it ate through the lid and the resultant gases corroded the ammo beyond use.
Don't use WD-40 or any high solvent or penetrating lubricant it can ruin the primers and leave the cases sticky.
Forgot to add some of the dry corrosion inhibitors like Eesox and Corrosion X work well on cases.
Last edited by DBoston; 01/03/21.
