Very handy to keep these little single use tubes around.  You never know what you'll be able to save by having around.  It's especially nice for things that you would throw away rather than fix, so it saves you money as well as your local landfill.  For example, I had a gallon chicken waterer base fall on the floor and crack.  A new one is over $3, cheap enough, but the glue was 1/3 the cost of that, so I'm ahead by gluing it, even though it would be easier to toss it.