I have just picked up 4 -55 gal. drums to store fuel for my wifes vw tdi. That would give me a six months supply of fuel. Before I filled the drums I am starting to worry about galvanized metal I am sure the sides are not, there is a little rust here and there and the metal is dark. However, the bottom is shiny, although it does not have that sparkly galvinized look to it.