I was at a flea market the other day just after I had finished turning a bowl project and was thinking about what finish I wanted to use on it when I found a guy selling these. He said that they were always kept in a dry basement. Each can has been opened and used but is still at least 3/4 full. Can these go bad? Whats the difference between tung oil and Danish oil? One can of the Danish oil is for (Black Walnut) and the other is (Natural). Oh...I paid $0.50 per can. I saw the can of Brasso after I paid him so he threw that in for free. I once read something about using Brasso on something and always thought that if I came across some I would buy it. I still don't remember what I wanted it for but I have it if I ever remember.