Where to find the cosmoline Yugoslavian used on their rifles? Those guns have been stored in the past 60 years without any sign of patina, let alone rust. They overdid it soaking the stock as well. If done appropriately, it should protect metal finish well. Not pretty but definitely works though
I have one sample in "Off Topic Firearms" column. They did excellent preservative job in cheap way. Best of all, it does dry in short period of time.