I end up having to keep going back to the store to buy more because I am always running out. I buy the 2 ounce bottles because I probably go through about an ounce or more of glue a month. I got several planes under construction one being a 1/2 scale biplane. I read, though, that someone was selling glue in 16 oz bottles and I decided to try them out. I got one bottle and I use it to refil my little bottles. I now store the big bottle in the fridge until I need it and so far so good.