Is it a lightweights? I had a lot of trouble with lightweights zippers. You could try wax paper but I think it is the same principle as soap.Anyone have a solution for a zipper on a vintage leather bag that sticks? Bar soap works for a couple of zips back and forth, then the zipper sticks again. The teeth appear to be in good condition and match up perfectly, but there is still stubborn zipper movement. Replacing the zipper is not an option - way too expensive.