I have not used my glue for some time. It suggests on the instructions that you should shake the container to restore the glue to a even consistancy. I did and the top came off. You may laugh, but the mess over lots of tools, my bench, and as I descovered later my watch, clothing, a real bummer. Also I now have very little glue, it was half full. I have never taken the top off. So if you are going to shake your glue hold you thumb over the top. Its a top tip.