I have used Barge cement for years, mostly during my days in the leather business (many moons ago). The old stuff was potent, and bombproof as a contact-type cement for sticking anything to anything. Last year I had need of it again and ordered a tube, and the new stuff arrived. I opened the tube and some thin liquid ran out, then whatever else was in there wouldn't budge. Called 3 Rivers and told them. They sent me another tube and it was the same thing! Then I asked around and was told "separation is normal--you have to mix it up in the tube". If anybody can figure this out I'd love to know how! I am now using another waterproof contact cement I got at the local hardware store. Weldwood, I think is the brand. Works fine, comes in a bottle with a brush, no problems.