Eldramesha wrote:I have some green stuff that is probably around 4 or 5 years old at this point. Is it still usable or should I just get some new stuff?
It depends on if it's still good or not!
Don't mean to be smart (ok, I did) but just mix some up and see what consistency you get. If it is free of dry chunks, cures at a normal rate, and is as workable as it should be, then it's fine. It will probably depend on how it has been stored.
The problem I have had with old green stuff is that it becomes tough and firm and so is a pain to work with, but if yours is still "gooey" it should be ok.
Good luck.